/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/array-crafted/zero_sum2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 14:53:25,855 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 14:53:25,857 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 14:53:25,891 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 14:53:25,892 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 14:53:25,895 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 14:53:25,898 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 14:53:25,901 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 14:53:25,902 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 14:53:25,907 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 14:53:25,908 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 14:53:25,910 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 14:53:25,910 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 14:53:25,913 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 14:53:25,914 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 14:53:25,916 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 14:53:25,917 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 14:53:25,917 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 14:53:25,919 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 14:53:25,924 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 14:53:25,925 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 14:53:25,926 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 14:53:25,926 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 14:53:25,927 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 14:53:25,931 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-02 14:53:25,934 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 14:53:25,935 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 14:53:25,936 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 14:53:25,936 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 14:53:25,937 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 14:53:25,937 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 14:53:25,937 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 14:53:25,938 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 14:53:25,938 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 14:53:25,938 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 14:53:25,939 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 14:53:25,940 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 14:53:25,971 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 14:53:25,972 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 14:53:25,972 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 14:53:25,972 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 14:53:25,973 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 14:53:25,973 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 14:53:25,973 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 14:53:25,974 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 14:53:25,974 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 14:53:25,974 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 14:53:25,974 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 14:53:25,975 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 14:53:25,975 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 14:53:25,975 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 14:53:25,975 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 14:53:25,975 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 14:53:25,975 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 14:53:25,975 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 14:53:25,976 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 14:53:25,976 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 14:53:25,976 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 14:53:25,976 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 14:53:25,976 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 14:53:25,976 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 14:53:25,976 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 14:53:25,977 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 14:53:25,977 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 14:53:25,977 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 14:53:25,977 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 14:53:25,977 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 14:53:25,977 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 14:53:25,977 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 14:53:25,977 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 14:53:25,978 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 14:53:25,978 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 14:53:25,978 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 14:53:25,978 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 14:53:25,978 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 14:53:25,978 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 14:53:25,978 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 14:53:25,978 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 14:53:25,979 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 14:53:26,196 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 14:53:26,220 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 14:53:26,223 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 14:53:26,224 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 14:53:26,225 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 14:53:26,226 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-crafted/zero_sum2.c [2023-04-02 14:53:27,299 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 14:53:27,475 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 14:53:27,475 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum2.c [2023-04-02 14:53:27,481 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/71cab933f/8423055503934d968ee3a0602369eef4/FLAGe8051cc5b [2023-04-02 14:53:27,495 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/71cab933f/8423055503934d968ee3a0602369eef4 [2023-04-02 14:53:27,497 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 14:53:27,498 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 14:53:27,501 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 14:53:27,501 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 14:53:27,504 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 14:53:27,505 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 02:53:27" (1/1) ... [2023-04-02 14:53:27,506 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2bfc8e3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:53:27, skipping insertion in model container [2023-04-02 14:53:27,506 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 02:53:27" (1/1) ... [2023-04-02 14:53:27,512 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 14:53:27,532 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 14:53:27,650 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum2.c[400,413] [2023-04-02 14:53:27,663 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 14:53:27,671 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 14:53:27,679 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-crafted/zero_sum2.c[400,413] [2023-04-02 14:53:27,685 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 14:53:27,696 INFO L208 MainTranslator]: Completed translation [2023-04-02 14:53:27,697 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:53:27 WrapperNode [2023-04-02 14:53:27,697 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 14:53:27,698 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 14:53:27,698 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 14:53:27,698 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 14:53:27,706 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:53:27" (1/1) ... [2023-04-02 14:53:27,706 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:53:27" (1/1) ... [2023-04-02 14:53:27,712 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:53:27" (1/1) ... [2023-04-02 14:53:27,713 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:53:27" (1/1) ... [2023-04-02 14:53:27,732 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:53:27" (1/1) ... [2023-04-02 14:53:27,736 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:53:27" (1/1) ... [2023-04-02 14:53:27,737 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:53:27" (1/1) ... [2023-04-02 14:53:27,738 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:53:27" (1/1) ... [2023-04-02 14:53:27,739 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 14:53:27,740 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 14:53:27,740 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 14:53:27,740 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 14:53:27,741 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:53:27" (1/1) ... [2023-04-02 14:53:27,751 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 14:53:27,763 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:53:27,776 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-02 14:53:27,777 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-02 14:53:27,802 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 14:53:27,802 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 14:53:27,802 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 14:53:27,802 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-02 14:53:27,802 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 14:53:27,803 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 14:53:27,803 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 14:53:27,803 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 14:53:27,803 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 14:53:27,803 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 14:53:27,803 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-02 14:53:27,803 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 14:53:27,803 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2023-04-02 14:53:27,803 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 14:53:27,804 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 14:53:27,804 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 14:53:27,804 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 14:53:27,804 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 14:53:27,804 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 14:53:27,804 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 14:53:27,805 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 14:53:27,862 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 14:53:27,863 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 14:53:27,988 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 14:53:28,055 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 14:53:28,055 INFO L302 CfgBuilder]: Removed 5 assume(true) statements. [2023-04-02 14:53:28,057 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 02:53:28 BoogieIcfgContainer [2023-04-02 14:53:28,057 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 14:53:28,059 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 14:53:28,059 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 14:53:28,075 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 14:53:28,075 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 02:53:27" (1/3) ... [2023-04-02 14:53:28,076 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43a12644 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 02:53:28, skipping insertion in model container [2023-04-02 14:53:28,076 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:53:27" (2/3) ... [2023-04-02 14:53:28,076 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43a12644 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 02:53:28, skipping insertion in model container [2023-04-02 14:53:28,076 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 02:53:28" (3/3) ... [2023-04-02 14:53:28,077 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum2.c [2023-04-02 14:53:28,111 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 14:53:28,111 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 14:53:28,151 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 14:53:28,156 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@a501cb8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 14:53:28,156 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 14:53:28,160 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 14:53:28,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-02 14:53:28,166 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:28,166 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:28,167 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:28,171 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:28,171 INFO L85 PathProgramCache]: Analyzing trace with hash -1747742048, now seen corresponding path program 1 times [2023-04-02 14:53:28,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:28,179 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737869216] [2023-04-02 14:53:28,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:28,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:28,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:28,398 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:53:28,398 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:28,398 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737869216] [2023-04-02 14:53:28,399 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [737869216] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 14:53:28,399 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 14:53:28,399 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 14:53:28,401 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639884170] [2023-04-02 14:53:28,401 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 14:53:28,404 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 14:53:28,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:28,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 14:53:28,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 14:53:28,442 INFO L87 Difference]: Start difference. First operand has 23 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:28,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:28,487 INFO L93 Difference]: Finished difference Result 40 states and 52 transitions. [2023-04-02 14:53:28,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 14:53:28,490 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2023-04-02 14:53:28,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:28,495 INFO L225 Difference]: With dead ends: 40 [2023-04-02 14:53:28,495 INFO L226 Difference]: Without dead ends: 17 [2023-04-02 14:53:28,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 14:53:28,500 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:28,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 29 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:53:28,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-04-02 14:53:28,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-04-02 14:53:28,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:28,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-04-02 14:53:28,545 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 15 [2023-04-02 14:53:28,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:28,545 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-04-02 14:53:28,545 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:28,546 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-04-02 14:53:28,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-04-02 14:53:28,546 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:28,546 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:28,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 14:53:28,547 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:28,547 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:28,548 INFO L85 PathProgramCache]: Analyzing trace with hash -1215019542, now seen corresponding path program 1 times [2023-04-02 14:53:28,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:28,548 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364679132] [2023-04-02 14:53:28,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:28,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:28,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:28,675 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 14:53:28,676 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:28,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364679132] [2023-04-02 14:53:28,676 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [364679132] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 14:53:28,676 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 14:53:28,676 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-02 14:53:28,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125721767] [2023-04-02 14:53:28,677 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 14:53:28,677 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 14:53:28,678 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:28,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 14:53:28,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-02 14:53:28,679 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:28,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:28,738 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2023-04-02 14:53:28,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 14:53:28,740 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2023-04-02 14:53:28,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:28,740 INFO L225 Difference]: With dead ends: 29 [2023-04-02 14:53:28,741 INFO L226 Difference]: Without dead ends: 21 [2023-04-02 14:53:28,741 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-02 14:53:28,742 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:28,743 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 15 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:53:28,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-04-02 14:53:28,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-04-02 14:53:28,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.3125) internal successors, (21), 16 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:28,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2023-04-02 14:53:28,747 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 16 [2023-04-02 14:53:28,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:28,748 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2023-04-02 14:53:28,748 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:28,748 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2023-04-02 14:53:28,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-04-02 14:53:28,748 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:28,748 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:28,748 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-02 14:53:28,749 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:28,749 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:28,749 INFO L85 PathProgramCache]: Analyzing trace with hash 784043139, now seen corresponding path program 1 times [2023-04-02 14:53:28,749 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:28,750 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [14785707] [2023-04-02 14:53:28,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:28,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:28,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:28,854 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 14:53:28,854 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:28,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [14785707] [2023-04-02 14:53:28,855 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [14785707] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:53:28,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [916908488] [2023-04-02 14:53:28,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:28,855 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:28,855 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:53:28,858 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:53:28,880 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 14:53:28,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:28,957 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 14:53:28,961 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:53:29,027 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 14:53:29,027 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:53:29,058 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 14:53:29,058 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [916908488] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:53:29,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [649182572] [2023-04-02 14:53:29,076 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:53:29,076 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:53:29,079 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:53:29,084 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:53:29,084 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:53:29,197 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:53:29,665 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:53:29,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:53:29,689 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:53:30,155 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '331#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:53:30,155 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:53:30,155 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:53:30,156 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-02 14:53:30,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876300801] [2023-04-02 14:53:30,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:53:30,158 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 14:53:30,158 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:30,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 14:53:30,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2023-04-02 14:53:30,161 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:30,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:30,215 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2023-04-02 14:53:30,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 14:53:30,216 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2023-04-02 14:53:30,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:30,217 INFO L225 Difference]: With dead ends: 35 [2023-04-02 14:53:30,217 INFO L226 Difference]: Without dead ends: 22 [2023-04-02 14:53:30,218 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2023-04-02 14:53:30,220 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:30,222 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 30 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:53:30,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-04-02 14:53:30,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-04-02 14:53:30,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:30,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2023-04-02 14:53:30,231 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 20 [2023-04-02 14:53:30,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:30,232 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2023-04-02 14:53:30,232 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:30,232 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2023-04-02 14:53:30,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 14:53:30,234 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:30,234 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:30,242 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 14:53:30,439 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:30,440 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:30,441 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:30,441 INFO L85 PathProgramCache]: Analyzing trace with hash -658942087, now seen corresponding path program 2 times [2023-04-02 14:53:30,441 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:30,441 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111096147] [2023-04-02 14:53:30,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:30,441 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:30,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:30,593 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 14:53:30,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:30,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111096147] [2023-04-02 14:53:30,597 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1111096147] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:53:30,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208431784] [2023-04-02 14:53:30,598 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:53:30,599 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:30,599 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:53:30,629 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:53:30,635 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 14:53:30,688 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 14:53:30,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:53:30,689 INFO L262 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 14:53:30,691 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:53:30,718 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 14:53:30,718 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:53:30,742 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 14:53:30,742 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [208431784] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:53:30,742 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1573226001] [2023-04-02 14:53:30,744 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:53:30,745 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:53:30,745 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:53:30,745 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:53:30,745 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:53:30,771 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:53:30,995 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:53:31,003 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:53:31,008 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:53:31,418 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '574#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:53:31,419 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:53:31,419 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:53:31,419 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-04-02 14:53:31,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049082670] [2023-04-02 14:53:31,419 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:53:31,420 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-02 14:53:31,420 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:31,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-02 14:53:31,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2023-04-02 14:53:31,421 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:31,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:31,463 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2023-04-02 14:53:31,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-02 14:53:31,466 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2023-04-02 14:53:31,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:31,467 INFO L225 Difference]: With dead ends: 37 [2023-04-02 14:53:31,467 INFO L226 Difference]: Without dead ends: 26 [2023-04-02 14:53:31,467 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2023-04-02 14:53:31,468 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:31,468 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 24 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:53:31,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-04-02 14:53:31,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-04-02 14:53:31,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:31,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2023-04-02 14:53:31,472 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 21 [2023-04-02 14:53:31,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:31,473 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2023-04-02 14:53:31,473 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:31,473 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2023-04-02 14:53:31,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-02 14:53:31,473 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:31,473 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:31,484 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 14:53:31,679 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-04-02 14:53:31,679 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:31,680 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:31,680 INFO L85 PathProgramCache]: Analyzing trace with hash -1473161856, now seen corresponding path program 3 times [2023-04-02 14:53:31,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:31,680 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989359878] [2023-04-02 14:53:31,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:31,680 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:31,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:32,774 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:53:32,774 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:32,774 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989359878] [2023-04-02 14:53:32,774 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1989359878] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:53:32,774 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144057120] [2023-04-02 14:53:32,774 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:53:32,775 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:32,775 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:53:32,776 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:53:32,803 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 14:53:32,841 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:53:32,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:53:32,842 INFO L262 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 48 conjunts are in the unsatisfiable core [2023-04-02 14:53:32,845 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:53:32,906 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-04-02 14:53:33,069 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:53:33,071 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:53:33,072 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2023-04-02 14:53:33,122 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:53:33,122 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:53:33,310 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 14:53:33,310 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2144057120] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:53:33,310 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [653582326] [2023-04-02 14:53:33,312 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:53:33,312 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:53:33,312 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:53:33,313 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:53:33,313 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:53:33,337 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:53:33,559 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:53:33,566 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:53:33,570 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:53:34,112 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '865#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:53:34,113 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:53:34,113 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:53:34,113 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 10] total 20 [2023-04-02 14:53:34,113 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103078398] [2023-04-02 14:53:34,113 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:53:34,114 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-02 14:53:34,114 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:34,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-02 14:53:34,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=846, Unknown=0, NotChecked=0, Total=930 [2023-04-02 14:53:34,115 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 20 states, 20 states have (on average 1.85) internal successors, (37), 18 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:34,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:34,291 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2023-04-02 14:53:34,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-02 14:53:34,292 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 18 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2023-04-02 14:53:34,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:34,293 INFO L225 Difference]: With dead ends: 41 [2023-04-02 14:53:34,293 INFO L226 Difference]: Without dead ends: 36 [2023-04-02 14:53:34,293 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 52 SyntacticMatches, 12 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2023-04-02 14:53:34,294 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:34,294 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 75 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:53:34,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-04-02 14:53:34,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2023-04-02 14:53:34,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:34,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2023-04-02 14:53:34,300 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 25 [2023-04-02 14:53:34,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:34,300 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2023-04-02 14:53:34,300 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 18 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:34,301 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2023-04-02 14:53:34,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-04-02 14:53:34,301 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:34,301 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:34,309 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 14:53:34,506 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:34,506 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:34,506 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:34,507 INFO L85 PathProgramCache]: Analyzing trace with hash -1548530666, now seen corresponding path program 4 times [2023-04-02 14:53:34,507 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:34,507 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [823813160] [2023-04-02 14:53:34,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:34,507 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:34,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:34,607 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 14:53:34,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:34,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [823813160] [2023-04-02 14:53:34,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [823813160] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:53:34,608 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [101626593] [2023-04-02 14:53:34,608 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:53:34,608 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:34,608 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:53:34,609 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:53:34,611 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 14:53:34,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:34,670 INFO L262 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 14:53:34,672 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:53:34,729 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 14:53:34,729 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:53:34,777 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 14:53:34,777 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [101626593] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:53:34,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1103337144] [2023-04-02 14:53:34,780 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:53:34,780 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:53:34,781 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:53:34,782 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:53:34,783 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:53:34,805 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:53:35,027 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:53:35,034 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:53:35,041 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:53:35,483 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1182#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:53:35,483 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:53:35,483 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:53:35,484 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-04-02 14:53:35,484 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995563002] [2023-04-02 14:53:35,484 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:53:35,484 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-02 14:53:35,484 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:35,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-02 14:53:35,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2023-04-02 14:53:35,485 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:35,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:35,595 INFO L93 Difference]: Finished difference Result 62 states and 76 transitions. [2023-04-02 14:53:35,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 14:53:35,597 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2023-04-02 14:53:35,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:35,597 INFO L225 Difference]: With dead ends: 62 [2023-04-02 14:53:35,597 INFO L226 Difference]: Without dead ends: 35 [2023-04-02 14:53:35,598 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 58 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=110, Invalid=646, Unknown=0, NotChecked=0, Total=756 [2023-04-02 14:53:35,599 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 18 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:35,599 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 41 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:53:35,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-04-02 14:53:35,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-04-02 14:53:35,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 30 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:35,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2023-04-02 14:53:35,604 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 26 [2023-04-02 14:53:35,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:35,604 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2023-04-02 14:53:35,604 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:35,605 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2023-04-02 14:53:35,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-04-02 14:53:35,605 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:35,605 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:35,616 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 14:53:35,806 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:35,806 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:35,806 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:35,806 INFO L85 PathProgramCache]: Analyzing trace with hash -1678866804, now seen corresponding path program 5 times [2023-04-02 14:53:35,807 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:35,807 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603749233] [2023-04-02 14:53:35,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:35,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:35,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:35,891 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:53:35,891 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:35,891 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603749233] [2023-04-02 14:53:35,891 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603749233] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:53:35,891 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16029151] [2023-04-02 14:53:35,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:53:35,892 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:35,892 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:53:35,893 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:53:35,918 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 14:53:35,961 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 14:53:35,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:53:35,962 INFO L262 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 14:53:35,964 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:53:36,027 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:53:36,028 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:53:36,089 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 14:53:36,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [16029151] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:53:36,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1300532621] [2023-04-02 14:53:36,091 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:53:36,091 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:53:36,091 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:53:36,116 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:53:36,116 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:53:36,138 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:53:36,297 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:53:36,302 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:53:36,306 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:53:36,708 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1553#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:53:36,708 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:53:36,708 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:53:36,709 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-04-02 14:53:36,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554257238] [2023-04-02 14:53:36,709 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:53:36,709 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-02 14:53:36,709 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:36,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-02 14:53:36,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2023-04-02 14:53:36,710 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:36,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:36,809 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2023-04-02 14:53:36,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 14:53:36,809 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2023-04-02 14:53:36,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:36,810 INFO L225 Difference]: With dead ends: 50 [2023-04-02 14:53:36,810 INFO L226 Difference]: Without dead ends: 31 [2023-04-02 14:53:36,810 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 60 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 264 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=130, Invalid=682, Unknown=0, NotChecked=0, Total=812 [2023-04-02 14:53:36,811 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 52 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:36,811 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 41 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:53:36,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-04-02 14:53:36,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2023-04-02 14:53:36,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 26 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:36,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2023-04-02 14:53:36,816 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 27 [2023-04-02 14:53:36,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:36,816 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2023-04-02 14:53:36,816 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:36,816 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2023-04-02 14:53:36,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-04-02 14:53:36,817 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:36,817 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:36,829 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-04-02 14:53:37,027 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:37,028 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:37,028 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:37,028 INFO L85 PathProgramCache]: Analyzing trace with hash 1549928483, now seen corresponding path program 6 times [2023-04-02 14:53:37,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:37,028 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998861362] [2023-04-02 14:53:37,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:37,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:37,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:38,299 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:53:38,300 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:38,300 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998861362] [2023-04-02 14:53:38,300 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [998861362] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:53:38,300 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [211463136] [2023-04-02 14:53:38,300 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:53:38,300 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:38,300 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:53:38,305 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:53:38,308 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 14:53:38,380 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:53:38,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:53:38,382 INFO L262 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 66 conjunts are in the unsatisfiable core [2023-04-02 14:53:38,385 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:53:38,409 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-04-02 14:53:38,792 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:53:38,792 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:53:39,132 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 14:53:39,133 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [211463136] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:53:39,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [676034586] [2023-04-02 14:53:39,135 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:53:39,135 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:53:39,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:53:39,135 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:53:39,135 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:53:39,157 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:53:39,306 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:53:39,310 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:53:39,313 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:53:39,855 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1934#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:53:39,855 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:53:39,855 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:53:39,856 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 16, 12] total 36 [2023-04-02 14:53:39,856 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146587335] [2023-04-02 14:53:39,856 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:53:39,856 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-04-02 14:53:39,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:39,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-04-02 14:53:39,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=2009, Unknown=0, NotChecked=0, Total=2162 [2023-04-02 14:53:39,858 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 36 states, 36 states have (on average 1.6666666666666667) internal successors, (60), 34 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:40,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:40,506 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2023-04-02 14:53:40,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-02 14:53:40,507 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.6666666666666667) internal successors, (60), 34 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2023-04-02 14:53:40,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:40,507 INFO L225 Difference]: With dead ends: 49 [2023-04-02 14:53:40,507 INFO L226 Difference]: Without dead ends: 44 [2023-04-02 14:53:40,509 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 58 SyntacticMatches, 10 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 947 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=233, Invalid=2847, Unknown=0, NotChecked=0, Total=3080 [2023-04-02 14:53:40,509 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 5 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 625 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 625 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:40,510 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 131 Invalid, 648 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 625 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 14:53:40,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-04-02 14:53:40,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2023-04-02 14:53:40,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 36 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:40,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2023-04-02 14:53:40,516 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 30 [2023-04-02 14:53:40,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:40,516 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2023-04-02 14:53:40,516 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.6666666666666667) internal successors, (60), 34 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:40,517 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2023-04-02 14:53:40,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-02 14:53:40,517 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:40,517 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:40,523 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-02 14:53:40,722 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:40,722 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:40,723 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:40,723 INFO L85 PathProgramCache]: Analyzing trace with hash -2043643645, now seen corresponding path program 7 times [2023-04-02 14:53:40,723 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:40,723 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872132131] [2023-04-02 14:53:40,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:40,723 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:40,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:40,831 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-02 14:53:40,832 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:40,832 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872132131] [2023-04-02 14:53:40,832 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872132131] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:53:40,832 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956139152] [2023-04-02 14:53:40,832 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:53:40,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:40,832 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:53:40,833 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:53:40,836 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 14:53:40,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:40,894 INFO L262 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 14:53:40,896 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:53:40,973 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-02 14:53:40,973 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:53:41,027 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-04-02 14:53:41,027 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1956139152] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:53:41,027 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2109826888] [2023-04-02 14:53:41,029 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:53:41,029 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:53:41,029 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:53:41,030 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:53:41,030 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:53:41,046 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:53:41,209 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:53:41,213 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:53:41,216 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:53:41,596 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2330#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:53:41,596 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:53:41,596 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:53:41,596 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2023-04-02 14:53:41,596 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553061936] [2023-04-02 14:53:41,596 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:53:41,597 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-02 14:53:41,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:41,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-02 14:53:41,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=650, Unknown=0, NotChecked=0, Total=756 [2023-04-02 14:53:41,598 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:41,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:41,724 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2023-04-02 14:53:41,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-02 14:53:41,725 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2023-04-02 14:53:41,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:41,727 INFO L225 Difference]: With dead ends: 76 [2023-04-02 14:53:41,727 INFO L226 Difference]: Without dead ends: 42 [2023-04-02 14:53:41,728 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 70 SyntacticMatches, 7 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=146, Invalid=846, Unknown=0, NotChecked=0, Total=992 [2023-04-02 14:53:41,728 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:41,728 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 37 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:53:41,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-04-02 14:53:41,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2023-04-02 14:53:41,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.2162162162162162) internal successors, (45), 37 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:41,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2023-04-02 14:53:41,735 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 31 [2023-04-02 14:53:41,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:41,735 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2023-04-02 14:53:41,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:41,736 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2023-04-02 14:53:41,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-04-02 14:53:41,736 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:41,736 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:41,742 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-02 14:53:41,936 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:41,937 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:41,937 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:41,937 INFO L85 PathProgramCache]: Analyzing trace with hash 1027954765, now seen corresponding path program 8 times [2023-04-02 14:53:41,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:41,937 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563318880] [2023-04-02 14:53:41,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:41,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:41,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:42,051 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-04-02 14:53:42,051 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:42,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563318880] [2023-04-02 14:53:42,052 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563318880] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:53:42,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256232592] [2023-04-02 14:53:42,052 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:53:42,052 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:42,052 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:53:42,053 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:53:42,055 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-02 14:53:42,120 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 14:53:42,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:53:42,122 INFO L262 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 10 conjunts are in the unsatisfiable core [2023-04-02 14:53:42,123 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:53:42,218 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-04-02 14:53:42,218 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:53:42,300 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-04-02 14:53:42,300 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1256232592] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:53:42,300 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2070173608] [2023-04-02 14:53:42,302 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:53:42,302 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:53:42,302 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:53:42,302 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:53:42,302 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:53:42,318 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:53:42,479 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:53:42,484 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:53:42,487 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:53:42,853 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2781#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:53:42,853 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:53:42,853 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:53:42,854 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2023-04-02 14:53:42,854 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010303121] [2023-04-02 14:53:42,854 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:53:42,854 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-02 14:53:42,854 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:42,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-02 14:53:42,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=811, Unknown=0, NotChecked=0, Total=930 [2023-04-02 14:53:42,855 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:43,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:43,010 INFO L93 Difference]: Finished difference Result 59 states and 71 transitions. [2023-04-02 14:53:43,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-02 14:53:43,016 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2023-04-02 14:53:43,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:43,016 INFO L225 Difference]: With dead ends: 59 [2023-04-02 14:53:43,016 INFO L226 Difference]: Without dead ends: 36 [2023-04-02 14:53:43,017 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 74 SyntacticMatches, 8 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 486 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=196, Invalid=1136, Unknown=0, NotChecked=0, Total=1332 [2023-04-02 14:53:43,017 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 70 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:43,018 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 65 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:53:43,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-04-02 14:53:43,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2023-04-02 14:53:43,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 31 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:43,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2023-04-02 14:53:43,023 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 32 [2023-04-02 14:53:43,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:43,023 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2023-04-02 14:53:43,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:43,023 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2023-04-02 14:53:43,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-04-02 14:53:43,024 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:43,024 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:43,031 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-02 14:53:43,229 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-02 14:53:43,229 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:43,230 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:43,230 INFO L85 PathProgramCache]: Analyzing trace with hash 933257312, now seen corresponding path program 9 times [2023-04-02 14:53:43,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:43,230 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2062144263] [2023-04-02 14:53:43,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:43,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:43,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:45,220 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:53:45,220 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:45,220 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2062144263] [2023-04-02 14:53:45,220 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2062144263] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:53:45,220 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [160947203] [2023-04-02 14:53:45,220 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:53:45,220 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:45,220 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:53:45,221 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:53:45,223 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-02 14:53:45,287 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:53:45,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:53:45,289 INFO L262 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 86 conjunts are in the unsatisfiable core [2023-04-02 14:53:45,291 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:53:45,348 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:53:45,734 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:53:45,734 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:53:46,188 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 14:53:46,188 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [160947203] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:53:46,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1453769450] [2023-04-02 14:53:46,189 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:53:46,189 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:53:46,190 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:53:46,190 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:53:46,190 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:53:46,207 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:53:46,353 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:53:46,357 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:53:46,360 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:53:47,009 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3239#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:53:47,010 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:53:47,010 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:53:47,010 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 19, 14] total 46 [2023-04-02 14:53:47,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881384629] [2023-04-02 14:53:47,010 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:53:47,010 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-04-02 14:53:47,010 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:47,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-04-02 14:53:47,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=2996, Unknown=0, NotChecked=0, Total=3192 [2023-04-02 14:53:47,013 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 46 states, 46 states have (on average 1.608695652173913) internal successors, (74), 44 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:48,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:48,160 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2023-04-02 14:53:48,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-04-02 14:53:48,161 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.608695652173913) internal successors, (74), 44 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2023-04-02 14:53:48,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:48,161 INFO L225 Difference]: With dead ends: 63 [2023-04-02 14:53:48,162 INFO L226 Difference]: Without dead ends: 58 [2023-04-02 14:53:48,163 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 74 SyntacticMatches, 5 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1370 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=352, Invalid=4904, Unknown=0, NotChecked=0, Total=5256 [2023-04-02 14:53:48,163 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 9 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 966 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 990 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 966 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:48,164 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 176 Invalid, 990 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 966 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-02 14:53:48,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-04-02 14:53:48,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 48. [2023-04-02 14:53:48,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.186046511627907) internal successors, (51), 43 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:48,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 55 transitions. [2023-04-02 14:53:48,172 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 55 transitions. Word has length 35 [2023-04-02 14:53:48,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:48,172 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 55 transitions. [2023-04-02 14:53:48,172 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.608695652173913) internal successors, (74), 44 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:48,172 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 55 transitions. [2023-04-02 14:53:48,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-04-02 14:53:48,175 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:48,176 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:48,183 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-02 14:53:48,381 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:48,381 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:48,382 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:48,382 INFO L85 PathProgramCache]: Analyzing trace with hash 1732233910, now seen corresponding path program 10 times [2023-04-02 14:53:48,382 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:48,382 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301253935] [2023-04-02 14:53:48,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:48,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:48,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:48,516 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-02 14:53:48,517 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:48,517 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301253935] [2023-04-02 14:53:48,517 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301253935] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:53:48,517 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1921216227] [2023-04-02 14:53:48,517 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:53:48,517 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:48,517 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:53:48,518 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:53:48,551 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-02 14:53:48,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:48,599 INFO L262 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 14:53:48,602 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:53:48,683 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-02 14:53:48,684 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:53:48,748 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-04-02 14:53:48,749 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1921216227] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:53:48,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [106609559] [2023-04-02 14:53:48,750 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:53:48,750 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:53:48,750 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:53:48,750 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:53:48,751 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:53:48,768 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:53:48,909 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:53:48,913 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:53:48,916 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:53:49,368 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3724#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:53:49,368 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:53:49,368 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:53:49,368 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2023-04-02 14:53:49,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330669593] [2023-04-02 14:53:49,368 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:53:49,369 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-04-02 14:53:49,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:49,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-04-02 14:53:49,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2023-04-02 14:53:49,370 INFO L87 Difference]: Start difference. First operand 48 states and 55 transitions. Second operand has 20 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:49,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:49,562 INFO L93 Difference]: Finished difference Result 90 states and 104 transitions. [2023-04-02 14:53:49,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-02 14:53:49,562 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2023-04-02 14:53:49,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:49,563 INFO L225 Difference]: With dead ends: 90 [2023-04-02 14:53:49,563 INFO L226 Difference]: Without dead ends: 49 [2023-04-02 14:53:49,564 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 82 SyntacticMatches, 9 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 447 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=189, Invalid=1071, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 14:53:49,564 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:49,564 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 77 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:53:49,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-04-02 14:53:49,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2023-04-02 14:53:49,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.1818181818181819) internal successors, (52), 44 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:49,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2023-04-02 14:53:49,572 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 36 [2023-04-02 14:53:49,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:49,576 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2023-04-02 14:53:49,576 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.65) internal successors, (33), 20 states have internal predecessors, (33), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:49,576 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2023-04-02 14:53:49,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-04-02 14:53:49,581 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:49,581 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:49,589 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-02 14:53:49,787 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-04-02 14:53:49,787 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:49,787 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:49,787 INFO L85 PathProgramCache]: Analyzing trace with hash 61139372, now seen corresponding path program 11 times [2023-04-02 14:53:49,787 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:49,787 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618550512] [2023-04-02 14:53:49,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:49,788 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:49,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:49,916 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-04-02 14:53:49,916 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:49,916 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618550512] [2023-04-02 14:53:49,916 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [618550512] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:53:49,916 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [284503590] [2023-04-02 14:53:49,916 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:53:49,916 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:49,917 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:53:49,918 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:53:49,920 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-02 14:53:49,996 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 14:53:49,997 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:53:49,998 INFO L262 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 14:53:49,999 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:53:50,121 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-04-02 14:53:50,121 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:53:50,206 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-04-02 14:53:50,206 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [284503590] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:53:50,206 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1550955980] [2023-04-02 14:53:50,208 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:53:50,208 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:53:50,208 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:53:50,208 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:53:50,208 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:53:50,223 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:53:50,341 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:53:50,344 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:53:50,347 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:53:50,721 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4253#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:53:50,721 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:53:50,721 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:53:50,721 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2023-04-02 14:53:50,721 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291998137] [2023-04-02 14:53:50,721 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:53:50,722 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-04-02 14:53:50,722 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:50,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-04-02 14:53:50,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1040, Unknown=0, NotChecked=0, Total=1190 [2023-04-02 14:53:50,723 INFO L87 Difference]: Start difference. First operand 49 states and 56 transitions. Second operand has 24 states, 24 states have (on average 1.875) internal successors, (45), 24 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:50,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:50,901 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2023-04-02 14:53:50,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-04-02 14:53:50,905 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.875) internal successors, (45), 24 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2023-04-02 14:53:50,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:50,905 INFO L225 Difference]: With dead ends: 68 [2023-04-02 14:53:50,905 INFO L226 Difference]: Without dead ends: 41 [2023-04-02 14:53:50,906 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 86 SyntacticMatches, 10 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 687 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=257, Invalid=1465, Unknown=0, NotChecked=0, Total=1722 [2023-04-02 14:53:50,907 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 69 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:50,907 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 66 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:53:50,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-04-02 14:53:50,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-04-02 14:53:50,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:50,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2023-04-02 14:53:50,915 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 37 [2023-04-02 14:53:50,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:50,915 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2023-04-02 14:53:50,915 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.875) internal successors, (45), 24 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:50,915 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2023-04-02 14:53:50,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-04-02 14:53:50,916 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:50,916 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:50,928 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-04-02 14:53:51,122 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-02 14:53:51,122 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:51,122 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:51,123 INFO L85 PathProgramCache]: Analyzing trace with hash 868711363, now seen corresponding path program 12 times [2023-04-02 14:53:51,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:51,123 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [585992523] [2023-04-02 14:53:51,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:51,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:51,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:53,343 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 1 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:53:53,343 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:53,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [585992523] [2023-04-02 14:53:53,343 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [585992523] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:53:53,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213584030] [2023-04-02 14:53:53,343 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:53:53,343 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:53,343 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:53:53,344 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:53:53,346 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-02 14:53:53,411 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:53:53,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:53:53,413 INFO L262 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 102 conjunts are in the unsatisfiable core [2023-04-02 14:53:53,415 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:53:53,494 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-04-02 14:53:54,112 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:53:54,112 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:53:54,720 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-04-02 14:53:54,720 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1213584030] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:53:54,720 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [545240449] [2023-04-02 14:53:54,721 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:53:54,721 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:53:54,721 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:53:54,722 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:53:54,722 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:53:54,739 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:53:54,893 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:53:54,896 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:53:54,899 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:53:55,600 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4784#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:53:55,600 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:53:55,600 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:53:55,600 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 22, 16] total 58 [2023-04-02 14:53:55,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835421839] [2023-04-02 14:53:55,600 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:53:55,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2023-04-02 14:53:55,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:55,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2023-04-02 14:53:55,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=4435, Unknown=0, NotChecked=0, Total=4692 [2023-04-02 14:53:55,603 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 58 states, 58 states have (on average 1.5517241379310345) internal successors, (90), 56 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:56,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:56,868 INFO L93 Difference]: Finished difference Result 65 states and 72 transitions. [2023-04-02 14:53:56,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-02 14:53:56,869 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.5517241379310345) internal successors, (90), 56 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2023-04-02 14:53:56,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:56,869 INFO L225 Difference]: With dead ends: 65 [2023-04-02 14:53:56,869 INFO L226 Difference]: Without dead ends: 60 [2023-04-02 14:53:56,871 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 80 SyntacticMatches, 6 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2205 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=447, Invalid=6693, Unknown=0, NotChecked=0, Total=7140 [2023-04-02 14:53:56,872 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 8 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 1162 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 1207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 1162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:56,872 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 178 Invalid, 1207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 1162 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-02 14:53:56,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-04-02 14:53:56,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 55. [2023-04-02 14:53:56,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.16) internal successors, (58), 50 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:56,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 62 transitions. [2023-04-02 14:53:56,883 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 62 transitions. Word has length 40 [2023-04-02 14:53:56,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:56,883 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 62 transitions. [2023-04-02 14:53:56,883 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.5517241379310345) internal successors, (90), 56 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:56,883 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 62 transitions. [2023-04-02 14:53:56,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-04-02 14:53:56,884 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:56,884 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:56,890 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-02 14:53:57,089 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-04-02 14:53:57,089 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:57,089 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:57,089 INFO L85 PathProgramCache]: Analyzing trace with hash -1763530013, now seen corresponding path program 13 times [2023-04-02 14:53:57,089 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:57,089 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553400955] [2023-04-02 14:53:57,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:57,090 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:57,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:57,252 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-02 14:53:57,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:57,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553400955] [2023-04-02 14:53:57,253 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1553400955] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:53:57,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647438344] [2023-04-02 14:53:57,253 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:53:57,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:57,253 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:53:57,254 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:53:57,255 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-02 14:53:57,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:57,320 INFO L262 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-02 14:53:57,321 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:53:57,433 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-02 14:53:57,433 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:53:57,509 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-02 14:53:57,509 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1647438344] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:53:57,509 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1023218708] [2023-04-02 14:53:57,511 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:53:57,511 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:53:57,511 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:53:57,511 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:53:57,511 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:53:57,523 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:53:57,659 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:53:57,664 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:53:57,667 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:53:58,095 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5320#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:53:58,096 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:53:58,096 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:53:58,096 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2023-04-02 14:53:58,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222050115] [2023-04-02 14:53:58,096 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:53:58,096 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-04-02 14:53:58,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:58,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-04-02 14:53:58,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=960, Unknown=0, NotChecked=0, Total=1122 [2023-04-02 14:53:58,097 INFO L87 Difference]: Start difference. First operand 55 states and 62 transitions. Second operand has 23 states, 23 states have (on average 1.565217391304348) internal successors, (36), 23 states have internal predecessors, (36), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:58,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:58,261 INFO L93 Difference]: Finished difference Result 104 states and 118 transitions. [2023-04-02 14:53:58,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-02 14:53:58,261 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.565217391304348) internal successors, (36), 23 states have internal predecessors, (36), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2023-04-02 14:53:58,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:58,262 INFO L225 Difference]: With dead ends: 104 [2023-04-02 14:53:58,262 INFO L226 Difference]: Without dead ends: 56 [2023-04-02 14:53:58,263 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 94 SyntacticMatches, 11 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 572 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=239, Invalid=1321, Unknown=0, NotChecked=0, Total=1560 [2023-04-02 14:53:58,263 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:58,264 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 41 Invalid, 246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:53:58,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-04-02 14:53:58,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2023-04-02 14:53:58,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 51 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:58,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2023-04-02 14:53:58,275 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 41 [2023-04-02 14:53:58,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:58,275 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2023-04-02 14:53:58,275 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.565217391304348) internal successors, (36), 23 states have internal predecessors, (36), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:58,276 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2023-04-02 14:53:58,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-04-02 14:53:58,276 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:58,276 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:58,283 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-04-02 14:53:58,482 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-04-02 14:53:58,482 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:53:58,483 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:53:58,483 INFO L85 PathProgramCache]: Analyzing trace with hash -959941203, now seen corresponding path program 14 times [2023-04-02 14:53:58,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:53:58,483 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994863269] [2023-04-02 14:53:58,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:53:58,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:53:58,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:53:58,645 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2023-04-02 14:53:58,645 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:53:58,645 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994863269] [2023-04-02 14:53:58,645 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1994863269] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:53:58,645 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [98362233] [2023-04-02 14:53:58,645 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:53:58,645 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:53:58,646 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:53:58,647 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:53:58,649 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-04-02 14:53:58,764 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 14:53:58,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:53:58,766 INFO L262 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-02 14:53:58,768 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:53:58,910 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2023-04-02 14:53:58,910 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:53:59,022 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2023-04-02 14:53:59,022 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [98362233] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:53:59,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [254939701] [2023-04-02 14:53:59,023 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:53:59,024 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:53:59,024 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:53:59,024 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:53:59,024 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:53:59,041 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:53:59,181 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:53:59,185 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:53:59,188 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:53:59,588 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5927#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:53:59,589 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:53:59,589 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:53:59,589 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2023-04-02 14:53:59,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857924025] [2023-04-02 14:53:59,589 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:53:59,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-04-02 14:53:59,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:53:59,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-04-02 14:53:59,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1296, Unknown=0, NotChecked=0, Total=1482 [2023-04-02 14:53:59,590 INFO L87 Difference]: Start difference. First operand 56 states and 63 transitions. Second operand has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 28 states have internal predecessors, (52), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:59,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:53:59,800 INFO L93 Difference]: Finished difference Result 77 states and 89 transitions. [2023-04-02 14:53:59,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-02 14:53:59,800 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 28 states have internal predecessors, (52), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2023-04-02 14:53:59,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:53:59,801 INFO L225 Difference]: With dead ends: 77 [2023-04-02 14:53:59,801 INFO L226 Difference]: Without dead ends: 46 [2023-04-02 14:53:59,801 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 98 SyntacticMatches, 12 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 920 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=328, Invalid=1834, Unknown=0, NotChecked=0, Total=2162 [2023-04-02 14:53:59,802 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 79 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:53:59,802 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 72 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:53:59,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-04-02 14:53:59,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-04-02 14:53:59,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 41 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:59,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2023-04-02 14:53:59,811 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 42 [2023-04-02 14:53:59,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:53:59,812 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2023-04-02 14:53:59,812 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 28 states have internal predecessors, (52), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:53:59,812 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2023-04-02 14:53:59,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-04-02 14:53:59,812 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:53:59,812 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:53:59,823 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-04-02 14:54:00,018 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:00,018 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:54:00,019 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:54:00,019 INFO L85 PathProgramCache]: Analyzing trace with hash 368751424, now seen corresponding path program 15 times [2023-04-02 14:54:00,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:54:00,019 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1378690376] [2023-04-02 14:54:00,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:54:00,019 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:54:00,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:02,939 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 3 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:54:02,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:54:02,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1378690376] [2023-04-02 14:54:02,940 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1378690376] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:54:02,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843643662] [2023-04-02 14:54:02,940 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:54:02,940 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:02,940 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:54:02,941 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:54:02,944 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-04-02 14:54:03,021 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:54:03,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:54:03,023 INFO L262 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 122 conjunts are in the unsatisfiable core [2023-04-02 14:54:03,025 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:54:03,154 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-04-02 14:54:03,717 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:54:03,717 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:54:04,524 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-02 14:54:04,525 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [843643662] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:54:04,525 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1969561022] [2023-04-02 14:54:04,526 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:54:04,526 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:54:04,526 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:54:04,526 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:54:04,526 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:54:04,540 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:54:04,669 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:54:04,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:54:04,675 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:54:05,462 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6526#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:54:05,462 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:54:05,463 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:54:05,463 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 25, 18] total 65 [2023-04-02 14:54:05,463 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399087715] [2023-04-02 14:54:05,463 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:54:05,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2023-04-02 14:54:05,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:54:05,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2023-04-02 14:54:05,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=295, Invalid=5405, Unknown=0, NotChecked=0, Total=5700 [2023-04-02 14:54:05,465 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 65 states, 65 states have (on average 1.5538461538461539) internal successors, (101), 63 states have internal predecessors, (101), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:06,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:54:06,955 INFO L93 Difference]: Finished difference Result 73 states and 80 transitions. [2023-04-02 14:54:06,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-04-02 14:54:06,956 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.5538461538461539) internal successors, (101), 63 states have internal predecessors, (101), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2023-04-02 14:54:06,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:54:06,956 INFO L225 Difference]: With dead ends: 73 [2023-04-02 14:54:06,956 INFO L226 Difference]: Without dead ends: 68 [2023-04-02 14:54:06,958 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 94 SyntacticMatches, 6 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2527 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=479, Invalid=7711, Unknown=0, NotChecked=0, Total=8190 [2023-04-02 14:54:06,958 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 8 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 1543 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 1588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 1543 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-04-02 14:54:06,958 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 209 Invalid, 1588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 1543 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-04-02 14:54:06,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-04-02 14:54:06,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 62. [2023-04-02 14:54:06,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 57 states have (on average 1.1403508771929824) internal successors, (65), 57 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:06,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 69 transitions. [2023-04-02 14:54:06,973 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 69 transitions. Word has length 45 [2023-04-02 14:54:06,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:54:06,973 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 69 transitions. [2023-04-02 14:54:06,973 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.5538461538461539) internal successors, (101), 63 states have internal predecessors, (101), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:06,973 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 69 transitions. [2023-04-02 14:54:06,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-04-02 14:54:06,974 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:54:06,974 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:54:06,981 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-04-02 14:54:07,177 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-04-02 14:54:07,177 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:54:07,177 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:54:07,177 INFO L85 PathProgramCache]: Analyzing trace with hash 712687958, now seen corresponding path program 16 times [2023-04-02 14:54:07,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:54:07,177 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680598405] [2023-04-02 14:54:07,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:54:07,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:54:07,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:07,377 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2023-04-02 14:54:07,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:54:07,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680598405] [2023-04-02 14:54:07,378 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1680598405] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:54:07,378 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542120293] [2023-04-02 14:54:07,378 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:54:07,378 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:07,378 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:54:07,379 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:54:07,382 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-04-02 14:54:07,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:07,468 INFO L262 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-02 14:54:07,469 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:54:07,614 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2023-04-02 14:54:07,614 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:54:07,726 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2023-04-02 14:54:07,727 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542120293] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:54:07,727 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1958446655] [2023-04-02 14:54:07,728 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:54:07,728 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:54:07,728 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:54:07,728 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:54:07,728 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:54:07,744 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:54:07,890 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:54:07,894 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:54:07,899 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:54:08,342 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7123#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:54:08,342 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:54:08,342 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:54:08,342 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2023-04-02 14:54:08,342 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367352218] [2023-04-02 14:54:08,342 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:54:08,342 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-04-02 14:54:08,342 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:54:08,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-04-02 14:54:08,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1136, Unknown=0, NotChecked=0, Total=1332 [2023-04-02 14:54:08,343 INFO L87 Difference]: Start difference. First operand 62 states and 69 transitions. Second operand has 26 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:08,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:54:08,549 INFO L93 Difference]: Finished difference Result 118 states and 132 transitions. [2023-04-02 14:54:08,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-04-02 14:54:08,549 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2023-04-02 14:54:08,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:54:08,551 INFO L225 Difference]: With dead ends: 118 [2023-04-02 14:54:08,551 INFO L226 Difference]: Without dead ends: 63 [2023-04-02 14:54:08,552 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 106 SyntacticMatches, 13 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 711 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=296, Invalid=1596, Unknown=0, NotChecked=0, Total=1892 [2023-04-02 14:54:08,554 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:54:08,554 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 53 Invalid, 302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:54:08,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-04-02 14:54:08,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2023-04-02 14:54:08,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.1379310344827587) internal successors, (66), 58 states have internal predecessors, (66), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:08,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 70 transitions. [2023-04-02 14:54:08,568 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 70 transitions. Word has length 46 [2023-04-02 14:54:08,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:54:08,568 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 70 transitions. [2023-04-02 14:54:08,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:08,569 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 70 transitions. [2023-04-02 14:54:08,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-04-02 14:54:08,570 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:54:08,570 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:54:08,579 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2023-04-02 14:54:08,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-04-02 14:54:08,776 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:54:08,776 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:54:08,776 INFO L85 PathProgramCache]: Analyzing trace with hash 760620236, now seen corresponding path program 17 times [2023-04-02 14:54:08,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:54:08,776 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762186367] [2023-04-02 14:54:08,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:54:08,777 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:54:08,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:08,972 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-04-02 14:54:08,973 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:54:08,973 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762186367] [2023-04-02 14:54:08,973 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762186367] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:54:08,973 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857008674] [2023-04-02 14:54:08,973 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:54:08,973 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:08,973 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:54:08,974 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:54:08,977 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-04-02 14:54:09,084 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-04-02 14:54:09,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:54:09,087 INFO L262 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-02 14:54:09,088 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:54:09,296 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-04-02 14:54:09,296 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:54:09,479 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-04-02 14:54:09,479 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1857008674] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:54:09,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1331027281] [2023-04-02 14:54:09,480 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:54:09,480 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:54:09,481 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:54:09,481 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:54:09,481 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:54:09,496 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:54:09,605 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:54:09,610 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:54:09,613 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:54:10,091 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7814#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:54:10,091 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:54:10,091 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:54:10,091 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 38 [2023-04-02 14:54:10,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741044451] [2023-04-02 14:54:10,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:54:10,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-04-02 14:54:10,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:54:10,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-04-02 14:54:10,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=2104, Unknown=0, NotChecked=0, Total=2352 [2023-04-02 14:54:10,093 INFO L87 Difference]: Start difference. First operand 63 states and 70 transitions. Second operand has 38 states, 38 states have (on average 1.368421052631579) internal successors, (52), 38 states have internal predecessors, (52), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:10,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:54:10,396 INFO L93 Difference]: Finished difference Result 86 states and 98 transitions. [2023-04-02 14:54:10,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-04-02 14:54:10,397 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.368421052631579) internal successors, (52), 38 states have internal predecessors, (52), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2023-04-02 14:54:10,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:54:10,397 INFO L225 Difference]: With dead ends: 86 [2023-04-02 14:54:10,397 INFO L226 Difference]: Without dead ends: 51 [2023-04-02 14:54:10,398 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 104 SyntacticMatches, 7 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1035 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=421, Invalid=2885, Unknown=0, NotChecked=0, Total=3306 [2023-04-02 14:54:10,398 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 184 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:54:10,398 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [184 Valid, 80 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 233 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:54:10,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-04-02 14:54:10,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2023-04-02 14:54:10,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.108695652173913) internal successors, (51), 46 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:10,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2023-04-02 14:54:10,407 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 47 [2023-04-02 14:54:10,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:54:10,407 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2023-04-02 14:54:10,407 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.368421052631579) internal successors, (52), 38 states have internal predecessors, (52), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:10,407 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2023-04-02 14:54:10,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-04-02 14:54:10,408 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:54:10,408 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:54:10,413 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-04-02 14:54:10,608 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:10,609 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:54:10,609 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:54:10,609 INFO L85 PathProgramCache]: Analyzing trace with hash 850519907, now seen corresponding path program 18 times [2023-04-02 14:54:10,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:54:10,609 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2065588182] [2023-04-02 14:54:10,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:54:10,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:54:10,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:14,544 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 3 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:54:14,544 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:54:14,544 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2065588182] [2023-04-02 14:54:14,544 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2065588182] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:54:14,544 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783150444] [2023-04-02 14:54:14,544 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:54:14,545 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:14,545 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:54:14,545 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:54:14,555 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-04-02 14:54:14,636 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:54:14,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:54:14,640 INFO L262 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 138 conjunts are in the unsatisfiable core [2023-04-02 14:54:14,643 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:54:14,792 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:54:15,494 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:54:15,496 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:54:15,497 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2023-04-02 14:54:15,601 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:54:15,602 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:54:16,679 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-04-02 14:54:16,680 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [783150444] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:54:16,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1567127936] [2023-04-02 14:54:16,681 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:54:16,681 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:54:16,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:54:16,681 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:54:16,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:54:16,696 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:54:16,794 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:54:16,797 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:54:16,799 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:54:17,620 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8468#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:54:17,620 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:54:17,620 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:54:17,620 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 28, 20] total 66 [2023-04-02 14:54:17,621 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220270134] [2023-04-02 14:54:17,621 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:54:17,621 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2023-04-02 14:54:17,621 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:54:17,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2023-04-02 14:54:17,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=5571, Unknown=0, NotChecked=0, Total=5852 [2023-04-02 14:54:17,622 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand has 66 states, 66 states have (on average 1.5909090909090908) internal successors, (105), 64 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:19,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:54:19,708 INFO L93 Difference]: Finished difference Result 81 states and 88 transitions. [2023-04-02 14:54:19,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-04-02 14:54:19,708 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 1.5909090909090908) internal successors, (105), 64 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2023-04-02 14:54:19,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:54:19,709 INFO L225 Difference]: With dead ends: 81 [2023-04-02 14:54:19,709 INFO L226 Difference]: Without dead ends: 76 [2023-04-02 14:54:19,709 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 101 SyntacticMatches, 17 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2641 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=563, Invalid=8943, Unknown=0, NotChecked=0, Total=9506 [2023-04-02 14:54:19,710 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 6 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 1721 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 1817 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 1721 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-04-02 14:54:19,710 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 215 Invalid, 1817 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 1721 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-04-02 14:54:19,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-04-02 14:54:19,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 69. [2023-04-02 14:54:19,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.125) internal successors, (72), 64 states have internal predecessors, (72), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:19,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 76 transitions. [2023-04-02 14:54:19,722 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 76 transitions. Word has length 50 [2023-04-02 14:54:19,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:54:19,723 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 76 transitions. [2023-04-02 14:54:19,723 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 1.5909090909090908) internal successors, (105), 64 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:19,723 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 76 transitions. [2023-04-02 14:54:19,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-04-02 14:54:19,723 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:54:19,723 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:54:19,729 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2023-04-02 14:54:19,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:19,924 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:54:19,924 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:54:19,924 INFO L85 PathProgramCache]: Analyzing trace with hash -517561149, now seen corresponding path program 19 times [2023-04-02 14:54:19,925 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:54:19,925 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720128436] [2023-04-02 14:54:19,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:54:19,925 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:54:19,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:20,163 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-04-02 14:54:20,163 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:54:20,163 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720128436] [2023-04-02 14:54:20,163 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1720128436] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:54:20,163 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2116496730] [2023-04-02 14:54:20,163 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:54:20,163 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:20,164 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:54:20,165 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:54:20,167 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-04-02 14:54:20,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:20,295 INFO L262 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 18 conjunts are in the unsatisfiable core [2023-04-02 14:54:20,296 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:54:20,468 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-04-02 14:54:20,468 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:54:20,607 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-04-02 14:54:20,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2116496730] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:54:20,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1379206186] [2023-04-02 14:54:20,608 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:54:20,609 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:54:20,609 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:54:20,609 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:54:20,609 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:54:20,626 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:54:20,780 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:54:20,784 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:54:20,787 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:54:21,215 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9140#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:54:21,215 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:54:21,215 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:54:21,215 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2023-04-02 14:54:21,215 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510920576] [2023-04-02 14:54:21,215 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:54:21,216 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-04-02 14:54:21,216 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:54:21,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-04-02 14:54:21,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=1326, Unknown=0, NotChecked=0, Total=1560 [2023-04-02 14:54:21,217 INFO L87 Difference]: Start difference. First operand 69 states and 76 transitions. Second operand has 29 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 29 states have internal predecessors, (42), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:21,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:54:21,453 INFO L93 Difference]: Finished difference Result 132 states and 146 transitions. [2023-04-02 14:54:21,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-02 14:54:21,453 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 29 states have internal predecessors, (42), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2023-04-02 14:54:21,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:54:21,453 INFO L225 Difference]: With dead ends: 132 [2023-04-02 14:54:21,453 INFO L226 Difference]: Without dead ends: 70 [2023-04-02 14:54:21,454 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 118 SyntacticMatches, 15 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 864 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=360, Invalid=1896, Unknown=0, NotChecked=0, Total=2256 [2023-04-02 14:54:21,455 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 332 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:54:21,455 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 61 Invalid, 374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 332 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:54:21,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2023-04-02 14:54:21,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2023-04-02 14:54:21,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.123076923076923) internal successors, (73), 65 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:21,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 77 transitions. [2023-04-02 14:54:21,472 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 77 transitions. Word has length 51 [2023-04-02 14:54:21,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:54:21,472 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 77 transitions. [2023-04-02 14:54:21,472 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 29 states have internal predecessors, (42), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:21,472 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 77 transitions. [2023-04-02 14:54:21,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-04-02 14:54:21,473 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:54:21,473 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:54:21,480 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2023-04-02 14:54:21,677 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:21,677 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:54:21,677 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:54:21,677 INFO L85 PathProgramCache]: Analyzing trace with hash 676133645, now seen corresponding path program 20 times [2023-04-02 14:54:21,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:54:21,677 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1064023342] [2023-04-02 14:54:21,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:54:21,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:54:21,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:21,907 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2023-04-02 14:54:21,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:54:21,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1064023342] [2023-04-02 14:54:21,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1064023342] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:54:21,908 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784099619] [2023-04-02 14:54:21,908 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:54:21,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:21,908 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:54:21,909 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:54:21,930 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-04-02 14:54:22,030 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-04-02 14:54:22,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:54:22,032 INFO L262 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 18 conjunts are in the unsatisfiable core [2023-04-02 14:54:22,034 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:54:22,168 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2023-04-02 14:54:22,168 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:54:22,309 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2023-04-02 14:54:22,309 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784099619] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:54:22,309 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1215730357] [2023-04-02 14:54:22,310 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:54:22,310 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:54:22,310 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:54:22,310 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:54:22,310 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:54:22,328 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:54:22,472 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:54:22,476 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:54:22,480 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:54:22,853 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9896#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:54:22,853 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:54:22,853 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:54:22,853 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2023-04-02 14:54:22,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112874260] [2023-04-02 14:54:22,853 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:54:22,854 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-04-02 14:54:22,854 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:54:22,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-04-02 14:54:22,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=1323, Unknown=0, NotChecked=0, Total=1560 [2023-04-02 14:54:22,854 INFO L87 Difference]: Start difference. First operand 70 states and 77 transitions. Second operand has 29 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 29 states have internal predecessors, (42), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:23,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:54:23,069 INFO L93 Difference]: Finished difference Result 95 states and 107 transitions. [2023-04-02 14:54:23,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-04-02 14:54:23,071 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 29 states have internal predecessors, (42), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2023-04-02 14:54:23,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:54:23,072 INFO L225 Difference]: With dead ends: 95 [2023-04-02 14:54:23,072 INFO L226 Difference]: Without dead ends: 56 [2023-04-02 14:54:23,072 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 120 SyntacticMatches, 16 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1012 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=445, Invalid=1907, Unknown=0, NotChecked=0, Total=2352 [2023-04-02 14:54:23,073 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 53 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:54:23,073 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 82 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:54:23,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-04-02 14:54:23,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2023-04-02 14:54:23,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 51 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:23,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2023-04-02 14:54:23,087 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 52 [2023-04-02 14:54:23,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:54:23,087 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2023-04-02 14:54:23,087 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 29 states have internal predecessors, (42), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:23,087 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2023-04-02 14:54:23,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-04-02 14:54:23,088 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:54:23,088 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:54:23,094 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2023-04-02 14:54:23,294 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-04-02 14:54:23,295 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:54:23,295 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:54:23,295 INFO L85 PathProgramCache]: Analyzing trace with hash 429542944, now seen corresponding path program 21 times [2023-04-02 14:54:23,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:54:23,295 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2070475963] [2023-04-02 14:54:23,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:54:23,295 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:54:23,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:28,686 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 3 proven. 177 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:54:28,686 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:54:28,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2070475963] [2023-04-02 14:54:28,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2070475963] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:54:28,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [549103039] [2023-04-02 14:54:28,686 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:54:28,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:28,686 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:54:28,687 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:54:28,689 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-04-02 14:54:28,785 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:54:28,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:54:28,788 INFO L262 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 158 conjunts are in the unsatisfiable core [2023-04-02 14:54:28,790 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:54:28,943 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:54:29,736 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:54:29,736 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:54:29,739 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:54:29,739 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 61 treesize of output 23 [2023-04-02 14:54:29,838 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:54:29,838 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:54:31,146 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-04-02 14:54:31,147 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [549103039] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:54:31,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1982342466] [2023-04-02 14:54:31,148 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:54:31,148 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:54:31,148 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:54:31,148 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:54:31,148 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:54:31,163 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:54:31,304 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:54:31,309 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:54:31,312 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:54:32,204 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10615#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:54:32,204 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:54:32,204 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:54:32,204 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 31, 22] total 74 [2023-04-02 14:54:32,204 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504249869] [2023-04-02 14:54:32,204 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:54:32,205 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2023-04-02 14:54:32,205 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:54:32,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2023-04-02 14:54:32,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=6757, Unknown=0, NotChecked=0, Total=7140 [2023-04-02 14:54:32,206 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 74 states, 74 states have (on average 1.5945945945945945) internal successors, (118), 72 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:34,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:54:34,545 INFO L93 Difference]: Finished difference Result 89 states and 96 transitions. [2023-04-02 14:54:34,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-04-02 14:54:34,545 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 1.5945945945945945) internal successors, (118), 72 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2023-04-02 14:54:34,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:54:34,546 INFO L225 Difference]: With dead ends: 89 [2023-04-02 14:54:34,546 INFO L226 Difference]: Without dead ends: 84 [2023-04-02 14:54:34,547 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 113 SyntacticMatches, 17 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3652 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=714, Invalid=10842, Unknown=0, NotChecked=0, Total=11556 [2023-04-02 14:54:34,547 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 6 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 1956 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 2029 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 1956 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:54:34,548 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 221 Invalid, 2029 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 1956 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-04-02 14:54:34,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-04-02 14:54:34,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 76. [2023-04-02 14:54:34,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.1126760563380282) internal successors, (79), 71 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:34,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 83 transitions. [2023-04-02 14:54:34,567 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 83 transitions. Word has length 55 [2023-04-02 14:54:34,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:54:34,567 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 83 transitions. [2023-04-02 14:54:34,567 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 1.5945945945945945) internal successors, (118), 72 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:34,568 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 83 transitions. [2023-04-02 14:54:34,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-04-02 14:54:34,568 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:54:34,568 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:54:34,574 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2023-04-02 14:54:34,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-04-02 14:54:34,771 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:54:34,771 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:54:34,771 INFO L85 PathProgramCache]: Analyzing trace with hash 688533494, now seen corresponding path program 22 times [2023-04-02 14:54:34,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:54:34,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [495058888] [2023-04-02 14:54:34,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:54:34,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:54:34,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:35,005 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2023-04-02 14:54:35,005 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:54:35,005 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [495058888] [2023-04-02 14:54:35,005 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [495058888] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:54:35,005 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [731207343] [2023-04-02 14:54:35,005 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:54:35,006 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:35,006 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:54:35,009 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:54:35,012 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-04-02 14:54:35,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:35,111 INFO L262 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 20 conjunts are in the unsatisfiable core [2023-04-02 14:54:35,112 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:54:35,285 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2023-04-02 14:54:35,285 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:54:35,420 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2023-04-02 14:54:35,420 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [731207343] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:54:35,420 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [849889407] [2023-04-02 14:54:35,421 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:54:35,421 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:54:35,421 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:54:35,421 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:54:35,422 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:54:35,443 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:54:35,596 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:54:35,600 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:54:35,603 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:54:36,074 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11354#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:54:36,074 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:54:36,074 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:54:36,074 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2023-04-02 14:54:36,074 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353519845] [2023-04-02 14:54:36,074 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:54:36,075 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-04-02 14:54:36,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:54:36,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-04-02 14:54:36,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=1530, Unknown=0, NotChecked=0, Total=1806 [2023-04-02 14:54:36,075 INFO L87 Difference]: Start difference. First operand 76 states and 83 transitions. Second operand has 32 states, 32 states have (on average 1.40625) internal successors, (45), 32 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:36,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:54:36,353 INFO L93 Difference]: Finished difference Result 146 states and 160 transitions. [2023-04-02 14:54:36,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-04-02 14:54:36,353 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.40625) internal successors, (45), 32 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2023-04-02 14:54:36,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:54:36,354 INFO L225 Difference]: With dead ends: 146 [2023-04-02 14:54:36,354 INFO L226 Difference]: Without dead ends: 77 [2023-04-02 14:54:36,354 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 130 SyntacticMatches, 17 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1031 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=431, Invalid=2221, Unknown=0, NotChecked=0, Total=2652 [2023-04-02 14:54:36,355 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:54:36,355 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 49 Invalid, 455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 409 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:54:36,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-04-02 14:54:36,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2023-04-02 14:54:36,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.1111111111111112) internal successors, (80), 72 states have internal predecessors, (80), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:36,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 84 transitions. [2023-04-02 14:54:36,370 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 84 transitions. Word has length 56 [2023-04-02 14:54:36,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:54:36,370 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 84 transitions. [2023-04-02 14:54:36,370 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.40625) internal successors, (45), 32 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:36,370 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 84 transitions. [2023-04-02 14:54:36,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-04-02 14:54:36,371 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:54:36,371 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:54:36,380 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2023-04-02 14:54:36,576 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:36,577 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:54:36,577 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:54:36,577 INFO L85 PathProgramCache]: Analyzing trace with hash -1464846356, now seen corresponding path program 23 times [2023-04-02 14:54:36,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:54:36,577 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523396045] [2023-04-02 14:54:36,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:54:36,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:54:36,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:36,855 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2023-04-02 14:54:36,855 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:54:36,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523396045] [2023-04-02 14:54:36,855 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523396045] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:54:36,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1424042024] [2023-04-02 14:54:36,856 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:54:36,856 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:36,856 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:54:36,857 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:54:36,881 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-04-02 14:54:37,000 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-04-02 14:54:37,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:54:37,002 INFO L262 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 20 conjunts are in the unsatisfiable core [2023-04-02 14:54:37,003 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:54:37,160 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2023-04-02 14:54:37,161 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:54:37,330 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2023-04-02 14:54:37,331 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1424042024] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:54:37,331 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [817870193] [2023-04-02 14:54:37,332 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:54:37,332 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:54:37,332 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:54:37,332 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:54:37,332 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:54:37,348 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:54:37,486 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:54:37,490 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:54:37,494 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:54:37,917 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12187#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:54:37,917 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:54:37,917 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:54:37,917 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2023-04-02 14:54:37,917 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960633241] [2023-04-02 14:54:37,917 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:54:37,917 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-04-02 14:54:37,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:54:37,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-04-02 14:54:37,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=1527, Unknown=0, NotChecked=0, Total=1806 [2023-04-02 14:54:37,918 INFO L87 Difference]: Start difference. First operand 77 states and 84 transitions. Second operand has 32 states, 32 states have (on average 1.40625) internal successors, (45), 32 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:38,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:54:38,154 INFO L93 Difference]: Finished difference Result 104 states and 116 transitions. [2023-04-02 14:54:38,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-04-02 14:54:38,154 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.40625) internal successors, (45), 32 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2023-04-02 14:54:38,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:54:38,154 INFO L225 Difference]: With dead ends: 104 [2023-04-02 14:54:38,154 INFO L226 Difference]: Without dead ends: 61 [2023-04-02 14:54:38,155 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 132 SyntacticMatches, 18 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=535, Invalid=2221, Unknown=0, NotChecked=0, Total=2756 [2023-04-02 14:54:38,155 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 102 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:54:38,156 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 66 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:54:38,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-04-02 14:54:38,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2023-04-02 14:54:38,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 56 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:38,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 65 transitions. [2023-04-02 14:54:38,173 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 65 transitions. Word has length 57 [2023-04-02 14:54:38,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:54:38,173 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 65 transitions. [2023-04-02 14:54:38,174 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.40625) internal successors, (45), 32 states have internal predecessors, (45), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:38,174 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 65 transitions. [2023-04-02 14:54:38,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-04-02 14:54:38,174 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:54:38,174 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:54:38,183 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-04-02 14:54:38,380 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:38,381 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:54:38,381 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:54:38,381 INFO L85 PathProgramCache]: Analyzing trace with hash 275204867, now seen corresponding path program 24 times [2023-04-02 14:54:38,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:54:38,381 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [244295488] [2023-04-02 14:54:38,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:54:38,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:54:38,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:44,645 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 10 proven. 215 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:54:44,645 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:54:44,645 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [244295488] [2023-04-02 14:54:44,645 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [244295488] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:54:44,645 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [224854617] [2023-04-02 14:54:44,645 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:54:44,646 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:44,646 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:54:44,646 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:54:44,648 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-04-02 14:54:44,751 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:54:44,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:54:44,754 INFO L262 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 174 conjunts are in the unsatisfiable core [2023-04-02 14:54:44,757 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:54:44,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:54:46,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 14:54:46,109 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:54:46,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 14:54:46,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 14:54:46,110 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:54:46,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-04-02 14:54:46,112 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:54:46,116 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:54:46,116 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 89 treesize of output 30 [2023-04-02 14:54:46,237 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:54:46,237 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:54:48,024 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 180 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-02 14:54:48,024 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [224854617] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:54:48,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1643566621] [2023-04-02 14:54:48,025 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:54:48,025 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:54:48,025 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:54:48,026 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:54:48,026 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:54:48,041 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:54:48,218 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:54:48,225 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:54:48,229 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:54:49,286 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12976#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:54:49,286 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:54:49,286 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:54:49,286 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 34, 24] total 84 [2023-04-02 14:54:49,286 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893562289] [2023-04-02 14:54:49,286 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:54:49,287 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2023-04-02 14:54:49,287 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:54:49,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2023-04-02 14:54:49,288 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=415, Invalid=8515, Unknown=0, NotChecked=0, Total=8930 [2023-04-02 14:54:49,288 INFO L87 Difference]: Start difference. First operand 61 states and 65 transitions. Second operand has 84 states, 84 states have (on average 1.5714285714285714) internal successors, (132), 82 states have internal predecessors, (132), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:52,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:54:52,610 INFO L93 Difference]: Finished difference Result 97 states and 104 transitions. [2023-04-02 14:54:52,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2023-04-02 14:54:52,611 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.5714285714285714) internal successors, (132), 82 states have internal predecessors, (132), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2023-04-02 14:54:52,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:54:52,611 INFO L225 Difference]: With dead ends: 97 [2023-04-02 14:54:52,611 INFO L226 Difference]: Without dead ends: 92 [2023-04-02 14:54:52,612 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 123 SyntacticMatches, 17 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4269 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=844, Invalid=13918, Unknown=0, NotChecked=0, Total=14762 [2023-04-02 14:54:52,612 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 7 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 2803 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 2919 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 2803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2023-04-02 14:54:52,612 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 296 Invalid, 2919 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 2803 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2023-04-02 14:54:52,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-04-02 14:54:52,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 83. [2023-04-02 14:54:52,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.1025641025641026) internal successors, (86), 78 states have internal predecessors, (86), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:52,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 90 transitions. [2023-04-02 14:54:52,631 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 90 transitions. Word has length 60 [2023-04-02 14:54:52,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:54:52,631 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 90 transitions. [2023-04-02 14:54:52,632 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 1.5714285714285714) internal successors, (132), 82 states have internal predecessors, (132), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:52,632 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 90 transitions. [2023-04-02 14:54:52,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-04-02 14:54:52,632 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:54:52,632 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:54:52,641 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2023-04-02 14:54:52,832 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-04-02 14:54:52,833 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:54:52,833 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:54:52,833 INFO L85 PathProgramCache]: Analyzing trace with hash -344562013, now seen corresponding path program 25 times [2023-04-02 14:54:52,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:54:52,833 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320646929] [2023-04-02 14:54:52,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:54:52,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:54:52,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:53,075 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2023-04-02 14:54:53,075 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:54:53,075 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320646929] [2023-04-02 14:54:53,075 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320646929] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:54:53,075 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [643334928] [2023-04-02 14:54:53,075 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:54:53,075 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:53,075 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:54:53,076 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:54:53,078 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-04-02 14:54:53,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:53,190 INFO L262 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 22 conjunts are in the unsatisfiable core [2023-04-02 14:54:53,192 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:54:53,401 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2023-04-02 14:54:53,401 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:54:53,560 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2023-04-02 14:54:53,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [643334928] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:54:53,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1505238813] [2023-04-02 14:54:53,562 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:54:53,562 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:54:53,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:54:53,562 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:54:53,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:54:53,577 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:54:53,682 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:54:53,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:54:53,694 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:54:54,157 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13786#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:54:54,158 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:54:54,158 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:54:54,158 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2023-04-02 14:54:54,158 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237062268] [2023-04-02 14:54:54,158 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:54:54,158 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-04-02 14:54:54,158 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:54:54,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-04-02 14:54:54,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=322, Invalid=1748, Unknown=0, NotChecked=0, Total=2070 [2023-04-02 14:54:54,159 INFO L87 Difference]: Start difference. First operand 83 states and 90 transitions. Second operand has 35 states, 35 states have (on average 1.3714285714285714) internal successors, (48), 35 states have internal predecessors, (48), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:54,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:54:54,471 INFO L93 Difference]: Finished difference Result 160 states and 174 transitions. [2023-04-02 14:54:54,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-02 14:54:54,472 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.3714285714285714) internal successors, (48), 35 states have internal predecessors, (48), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2023-04-02 14:54:54,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:54:54,472 INFO L225 Difference]: With dead ends: 160 [2023-04-02 14:54:54,472 INFO L226 Difference]: Without dead ends: 84 [2023-04-02 14:54:54,473 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 142 SyntacticMatches, 19 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1212 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=509, Invalid=2571, Unknown=0, NotChecked=0, Total=3080 [2023-04-02 14:54:54,473 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 20 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 391 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:54:54,473 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 65 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 391 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:54:54,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-04-02 14:54:54,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2023-04-02 14:54:54,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.1012658227848102) internal successors, (87), 79 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:54,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 91 transitions. [2023-04-02 14:54:54,493 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 91 transitions. Word has length 61 [2023-04-02 14:54:54,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:54:54,493 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 91 transitions. [2023-04-02 14:54:54,493 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.3714285714285714) internal successors, (48), 35 states have internal predecessors, (48), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:54,493 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 91 transitions. [2023-04-02 14:54:54,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2023-04-02 14:54:54,494 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:54:54,494 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:54:54,510 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2023-04-02 14:54:54,701 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-04-02 14:54:54,701 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:54:54,701 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:54:54,701 INFO L85 PathProgramCache]: Analyzing trace with hash -649795475, now seen corresponding path program 26 times [2023-04-02 14:54:54,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:54:54,701 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704037475] [2023-04-02 14:54:54,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:54:54,702 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:54:54,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:54:54,956 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-04-02 14:54:54,956 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:54:54,956 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704037475] [2023-04-02 14:54:54,956 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704037475] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:54:54,956 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [369235144] [2023-04-02 14:54:54,956 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:54:54,957 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:54:54,957 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:54:54,957 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:54:54,959 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-04-02 14:54:55,142 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-04-02 14:54:55,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:54:55,145 INFO L262 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 22 conjunts are in the unsatisfiable core [2023-04-02 14:54:55,146 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:54:55,348 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-04-02 14:54:55,348 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:54:55,543 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-04-02 14:54:55,543 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [369235144] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:54:55,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1141435991] [2023-04-02 14:54:55,544 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:54:55,544 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:54:55,544 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:54:55,544 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:54:55,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:54:55,561 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:54:55,676 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:54:55,680 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:54:55,682 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:54:56,097 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14696#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:54:56,097 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:54:56,097 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:54:56,098 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2023-04-02 14:54:56,098 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387623306] [2023-04-02 14:54:56,098 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:54:56,098 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-04-02 14:54:56,098 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:54:56,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-04-02 14:54:56,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=1745, Unknown=0, NotChecked=0, Total=2070 [2023-04-02 14:54:56,099 INFO L87 Difference]: Start difference. First operand 84 states and 91 transitions. Second operand has 35 states, 35 states have (on average 1.8) internal successors, (63), 35 states have internal predecessors, (63), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:56,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:54:56,363 INFO L93 Difference]: Finished difference Result 113 states and 125 transitions. [2023-04-02 14:54:56,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-02 14:54:56,363 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.8) internal successors, (63), 35 states have internal predecessors, (63), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2023-04-02 14:54:56,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:54:56,363 INFO L225 Difference]: With dead ends: 113 [2023-04-02 14:54:56,363 INFO L226 Difference]: Without dead ends: 66 [2023-04-02 14:54:56,364 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 144 SyntacticMatches, 20 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1431 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=634, Invalid=2558, Unknown=0, NotChecked=0, Total=3192 [2023-04-02 14:54:56,364 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 104 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:54:56,365 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 98 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:54:56,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-04-02 14:54:56,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2023-04-02 14:54:56,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.0819672131147542) internal successors, (66), 61 states have internal predecessors, (66), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:56,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2023-04-02 14:54:56,393 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 62 [2023-04-02 14:54:56,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:54:56,393 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2023-04-02 14:54:56,393 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.8) internal successors, (63), 35 states have internal predecessors, (63), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:54:56,393 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2023-04-02 14:54:56,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2023-04-02 14:54:56,393 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:54:56,393 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:54:56,399 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2023-04-02 14:54:56,594 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-04-02 14:54:56,594 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:54:56,594 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:54:56,594 INFO L85 PathProgramCache]: Analyzing trace with hash -1084673792, now seen corresponding path program 27 times [2023-04-02 14:54:56,594 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:54:56,595 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029261558] [2023-04-02 14:54:56,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:54:56,595 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:54:56,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:55:02,857 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 7 proven. 268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:55:02,858 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:55:02,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029261558] [2023-04-02 14:55:02,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2029261558] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:55:02,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1898176356] [2023-04-02 14:55:02,858 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:55:02,859 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:55:02,859 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:55:02,860 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:55:02,861 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-04-02 14:55:02,979 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:55:02,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:55:02,982 WARN L260 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 194 conjunts are in the unsatisfiable core [2023-04-02 14:55:02,985 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:55:03,312 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:55:05,087 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:55:05,089 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:55:05,090 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2023-04-02 14:55:05,252 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:55:05,252 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:55:07,638 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 0 proven. 220 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-04-02 14:55:07,638 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1898176356] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:55:07,638 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1729158505] [2023-04-02 14:55:07,639 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:55:07,639 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:55:07,639 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:55:07,639 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:55:07,639 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:55:07,652 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:55:07,776 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:55:07,779 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:55:07,782 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:55:08,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15558#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:55:08,947 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:55:08,947 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:55:08,947 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 37, 26] total 97 [2023-04-02 14:55:08,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944223244] [2023-04-02 14:55:08,947 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:55:08,947 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2023-04-02 14:55:08,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:55:08,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2023-04-02 14:55:08,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=448, Invalid=11108, Unknown=0, NotChecked=0, Total=11556 [2023-04-02 14:55:08,949 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand has 97 states, 97 states have (on average 1.5360824742268042) internal successors, (149), 95 states have internal predecessors, (149), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:13,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:55:13,726 INFO L93 Difference]: Finished difference Result 105 states and 112 transitions. [2023-04-02 14:55:13,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2023-04-02 14:55:13,727 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.5360824742268042) internal successors, (149), 95 states have internal predecessors, (149), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2023-04-02 14:55:13,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:55:13,727 INFO L225 Difference]: With dead ends: 105 [2023-04-02 14:55:13,727 INFO L226 Difference]: Without dead ends: 100 [2023-04-02 14:55:13,729 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 126 SyntacticMatches, 21 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5536 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=965, Invalid=17941, Unknown=0, NotChecked=0, Total=18906 [2023-04-02 14:55:13,729 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 12 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 3483 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 325 SdHoareTripleChecker+Invalid, 3619 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 3483 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:55:13,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 325 Invalid, 3619 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 3483 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2023-04-02 14:55:13,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-04-02 14:55:13,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 90. [2023-04-02 14:55:13,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.0941176470588236) internal successors, (93), 85 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:13,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 97 transitions. [2023-04-02 14:55:13,757 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 97 transitions. Word has length 65 [2023-04-02 14:55:13,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:55:13,757 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 97 transitions. [2023-04-02 14:55:13,757 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.5360824742268042) internal successors, (149), 95 states have internal predecessors, (149), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:13,757 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 97 transitions. [2023-04-02 14:55:13,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2023-04-02 14:55:13,758 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:55:13,758 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:55:13,771 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2023-04-02 14:55:13,965 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-04-02 14:55:13,965 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:55:13,965 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:55:13,965 INFO L85 PathProgramCache]: Analyzing trace with hash -1609296234, now seen corresponding path program 28 times [2023-04-02 14:55:13,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:55:13,965 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094297507] [2023-04-02 14:55:13,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:55:13,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:55:13,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:55:14,249 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2023-04-02 14:55:14,250 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:55:14,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094297507] [2023-04-02 14:55:14,250 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2094297507] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:55:14,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [344701852] [2023-04-02 14:55:14,250 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:55:14,250 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:55:14,250 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:55:14,251 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:55:14,253 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-04-02 14:55:14,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:55:14,377 INFO L262 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-02 14:55:14,378 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:55:14,633 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2023-04-02 14:55:14,633 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:55:14,811 INFO L134 CoverageAnalysis]: Checked inductivity of 286 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2023-04-02 14:55:14,811 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [344701852] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:55:14,811 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [39655875] [2023-04-02 14:55:14,812 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:55:14,812 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:55:14,812 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:55:14,813 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:55:14,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:55:14,826 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:55:14,951 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:55:14,955 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:55:14,957 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:55:15,419 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16437#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:55:15,419 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:55:15,419 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:55:15,419 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2023-04-02 14:55:15,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079964269] [2023-04-02 14:55:15,419 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:55:15,419 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-04-02 14:55:15,419 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:55:15,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-04-02 14:55:15,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=372, Invalid=1980, Unknown=0, NotChecked=0, Total=2352 [2023-04-02 14:55:15,421 INFO L87 Difference]: Start difference. First operand 90 states and 97 transitions. Second operand has 38 states, 38 states have (on average 1.3421052631578947) internal successors, (51), 38 states have internal predecessors, (51), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:15,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:55:15,797 INFO L93 Difference]: Finished difference Result 174 states and 188 transitions. [2023-04-02 14:55:15,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-04-02 14:55:15,797 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.3421052631578947) internal successors, (51), 38 states have internal predecessors, (51), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 66 [2023-04-02 14:55:15,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:55:15,797 INFO L225 Difference]: With dead ends: 174 [2023-04-02 14:55:15,797 INFO L226 Difference]: Without dead ends: 91 [2023-04-02 14:55:15,798 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 154 SyntacticMatches, 21 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1407 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=594, Invalid=2946, Unknown=0, NotChecked=0, Total=3540 [2023-04-02 14:55:15,799 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 16 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 550 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:55:15,799 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 73 Invalid, 606 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 550 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:55:15,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2023-04-02 14:55:15,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2023-04-02 14:55:15,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0930232558139534) internal successors, (94), 86 states have internal predecessors, (94), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:15,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2023-04-02 14:55:15,824 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 66 [2023-04-02 14:55:15,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:55:15,824 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2023-04-02 14:55:15,824 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.3421052631578947) internal successors, (51), 38 states have internal predecessors, (51), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:15,824 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2023-04-02 14:55:15,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-04-02 14:55:15,825 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:55:15,825 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:55:15,830 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2023-04-02 14:55:16,025 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:55:16,025 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:55:16,025 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:55:16,026 INFO L85 PathProgramCache]: Analyzing trace with hash -1662967028, now seen corresponding path program 29 times [2023-04-02 14:55:16,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:55:16,026 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118195275] [2023-04-02 14:55:16,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:55:16,026 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:55:16,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:55:16,317 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2023-04-02 14:55:16,317 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:55:16,317 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118195275] [2023-04-02 14:55:16,317 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2118195275] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:55:16,317 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [43315545] [2023-04-02 14:55:16,317 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:55:16,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:55:16,318 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:55:16,318 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:55:16,320 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2023-04-02 14:55:16,521 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-04-02 14:55:16,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:55:16,523 INFO L262 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-02 14:55:16,524 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:55:16,893 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2023-04-02 14:55:16,894 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:55:17,275 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2023-04-02 14:55:17,275 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [43315545] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:55:17,275 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1113593655] [2023-04-02 14:55:17,276 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:55:17,276 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:55:17,277 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:55:17,277 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:55:17,277 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:55:17,292 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:55:17,407 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:55:17,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:55:17,413 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:55:17,992 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17444#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:55:17,992 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:55:17,992 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:55:17,992 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 58 [2023-04-02 14:55:17,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109644526] [2023-04-02 14:55:17,992 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:55:17,993 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2023-04-02 14:55:17,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:55:17,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2023-04-02 14:55:17,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=4192, Unknown=0, NotChecked=0, Total=4692 [2023-04-02 14:55:17,994 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand has 58 states, 58 states have (on average 1.2413793103448276) internal successors, (72), 58 states have internal predecessors, (72), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:18,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:55:18,449 INFO L93 Difference]: Finished difference Result 122 states and 134 transitions. [2023-04-02 14:55:18,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-04-02 14:55:18,449 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.2413793103448276) internal successors, (72), 58 states have internal predecessors, (72), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2023-04-02 14:55:18,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:55:18,449 INFO L225 Difference]: With dead ends: 122 [2023-04-02 14:55:18,449 INFO L226 Difference]: Without dead ends: 71 [2023-04-02 14:55:18,450 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 148 SyntacticMatches, 11 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2273 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=879, Invalid=5763, Unknown=0, NotChecked=0, Total=6642 [2023-04-02 14:55:18,451 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 317 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:55:18,451 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [317 Valid, 82 Invalid, 477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:55:18,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2023-04-02 14:55:18,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2023-04-02 14:55:18,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 66 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:18,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 75 transitions. [2023-04-02 14:55:18,477 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 75 transitions. Word has length 67 [2023-04-02 14:55:18,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:55:18,478 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 75 transitions. [2023-04-02 14:55:18,478 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.2413793103448276) internal successors, (72), 58 states have internal predecessors, (72), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:18,478 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 75 transitions. [2023-04-02 14:55:18,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2023-04-02 14:55:18,478 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:55:18,478 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:55:18,484 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2023-04-02 14:55:18,680 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:55:18,681 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:55:18,681 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:55:18,681 INFO L85 PathProgramCache]: Analyzing trace with hash 497919651, now seen corresponding path program 30 times [2023-04-02 14:55:18,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:55:18,681 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1289835547] [2023-04-02 14:55:18,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:55:18,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:55:18,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:55:25,459 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 10 proven. 320 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:55:25,460 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:55:25,460 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1289835547] [2023-04-02 14:55:25,460 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1289835547] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:55:25,460 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442507076] [2023-04-02 14:55:25,460 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:55:25,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:55:25,460 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:55:25,461 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:55:25,463 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2023-04-02 14:55:25,593 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:55:25,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:55:25,597 WARN L260 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 210 conjunts are in the unsatisfiable core [2023-04-02 14:55:25,600 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:55:25,872 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:55:26,856 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:55:26,858 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:55:26,858 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2023-04-02 14:55:26,994 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:55:26,994 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:55:29,581 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2023-04-02 14:55:29,581 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442507076] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:55:29,581 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2133219927] [2023-04-02 14:55:29,582 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:55:29,582 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:55:29,582 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:55:29,582 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:55:29,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:55:29,597 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:55:29,709 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:55:29,714 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:55:29,716 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:55:30,855 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18373#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:55:30,856 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:55:30,856 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:55:30,856 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 40, 28] total 101 [2023-04-02 14:55:30,856 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912191277] [2023-04-02 14:55:30,856 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:55:30,856 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2023-04-02 14:55:30,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:55:30,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2023-04-02 14:55:30,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=594, Invalid=11838, Unknown=0, NotChecked=0, Total=12432 [2023-04-02 14:55:30,858 INFO L87 Difference]: Start difference. First operand 71 states and 75 transitions. Second operand has 101 states, 101 states have (on average 1.5544554455445545) internal successors, (157), 99 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:35,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:55:35,510 INFO L93 Difference]: Finished difference Result 113 states and 120 transitions. [2023-04-02 14:55:35,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2023-04-02 14:55:35,511 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.5544554455445545) internal successors, (157), 99 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2023-04-02 14:55:35,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:55:35,511 INFO L225 Difference]: With dead ends: 113 [2023-04-02 14:55:35,511 INFO L226 Difference]: Without dead ends: 108 [2023-04-02 14:55:35,512 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 154 SyntacticMatches, 9 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6125 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=1150, Invalid=19156, Unknown=0, NotChecked=0, Total=20306 [2023-04-02 14:55:35,513 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 8 mSDsluCounter, 316 mSDsCounter, 0 mSdLazyCounter, 3625 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 3734 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 3625 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:55:35,513 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 324 Invalid, 3734 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 3625 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2023-04-02 14:55:35,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2023-04-02 14:55:35,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 97. [2023-04-02 14:55:35,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0869565217391304) internal successors, (100), 92 states have internal predecessors, (100), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:35,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 104 transitions. [2023-04-02 14:55:35,548 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 104 transitions. Word has length 70 [2023-04-02 14:55:35,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:55:35,548 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 104 transitions. [2023-04-02 14:55:35,548 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.5544554455445545) internal successors, (157), 99 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:35,548 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 104 transitions. [2023-04-02 14:55:35,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-04-02 14:55:35,549 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:55:35,549 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:55:35,557 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2023-04-02 14:55:35,755 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2023-04-02 14:55:35,755 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:55:35,756 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:55:35,756 INFO L85 PathProgramCache]: Analyzing trace with hash 449572995, now seen corresponding path program 31 times [2023-04-02 14:55:35,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:55:35,756 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625703820] [2023-04-02 14:55:35,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:55:35,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:55:35,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:55:36,101 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2023-04-02 14:55:36,101 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:55:36,101 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625703820] [2023-04-02 14:55:36,101 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625703820] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:55:36,101 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2138668493] [2023-04-02 14:55:36,101 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:55:36,101 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:55:36,102 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:55:36,103 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:55:36,104 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2023-04-02 14:55:36,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:55:36,232 INFO L262 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 26 conjunts are in the unsatisfiable core [2023-04-02 14:55:36,233 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:55:36,521 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2023-04-02 14:55:36,521 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:55:36,744 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2023-04-02 14:55:36,744 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2138668493] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:55:36,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [889200555] [2023-04-02 14:55:36,745 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:55:36,745 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:55:36,745 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:55:36,745 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:55:36,745 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:55:36,757 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:55:36,881 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:55:36,885 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:55:36,887 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:55:37,369 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19317#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:55:37,370 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:55:37,370 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:55:37,370 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2023-04-02 14:55:37,370 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083220929] [2023-04-02 14:55:37,370 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:55:37,370 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2023-04-02 14:55:37,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:55:37,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2023-04-02 14:55:37,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=2226, Unknown=0, NotChecked=0, Total=2652 [2023-04-02 14:55:37,371 INFO L87 Difference]: Start difference. First operand 97 states and 104 transitions. Second operand has 41 states, 41 states have (on average 1.3170731707317074) internal successors, (54), 41 states have internal predecessors, (54), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:37,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:55:37,785 INFO L93 Difference]: Finished difference Result 188 states and 202 transitions. [2023-04-02 14:55:37,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-04-02 14:55:37,786 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.3170731707317074) internal successors, (54), 41 states have internal predecessors, (54), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2023-04-02 14:55:37,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:55:37,786 INFO L225 Difference]: With dead ends: 188 [2023-04-02 14:55:37,786 INFO L226 Difference]: Without dead ends: 98 [2023-04-02 14:55:37,787 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 166 SyntacticMatches, 23 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1616 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=686, Invalid=3346, Unknown=0, NotChecked=0, Total=4032 [2023-04-02 14:55:37,787 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:55:37,787 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 65 Invalid, 530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 469 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:55:37,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2023-04-02 14:55:37,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2023-04-02 14:55:37,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 93 states have (on average 1.086021505376344) internal successors, (101), 93 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:37,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 105 transitions. [2023-04-02 14:55:37,816 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 105 transitions. Word has length 71 [2023-04-02 14:55:37,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:55:37,817 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 105 transitions. [2023-04-02 14:55:37,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.3170731707317074) internal successors, (54), 41 states have internal predecessors, (54), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:37,817 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 105 transitions. [2023-04-02 14:55:37,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2023-04-02 14:55:37,817 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:55:37,817 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:55:37,824 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2023-04-02 14:55:38,017 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:55:38,018 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:55:38,018 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:55:38,018 INFO L85 PathProgramCache]: Analyzing trace with hash 1503804877, now seen corresponding path program 32 times [2023-04-02 14:55:38,018 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:55:38,018 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94974711] [2023-04-02 14:55:38,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:55:38,018 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:55:38,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:55:38,350 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2023-04-02 14:55:38,350 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:55:38,350 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94974711] [2023-04-02 14:55:38,350 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94974711] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:55:38,350 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [378138265] [2023-04-02 14:55:38,350 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:55:38,350 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:55:38,350 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:55:38,351 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:55:38,353 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2023-04-02 14:55:38,561 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-04-02 14:55:38,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:55:38,564 INFO L262 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 26 conjunts are in the unsatisfiable core [2023-04-02 14:55:38,565 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:55:38,976 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2023-04-02 14:55:38,977 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:55:39,300 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2023-04-02 14:55:39,300 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [378138265] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:55:39,300 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1215862581] [2023-04-02 14:55:39,301 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:55:39,301 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:55:39,301 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:55:39,301 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:55:39,301 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:55:39,317 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:55:39,444 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:55:39,449 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:55:39,451 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:55:39,941 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20392#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:55:39,941 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:55:39,941 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:55:39,941 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2023-04-02 14:55:39,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311767410] [2023-04-02 14:55:39,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:55:39,941 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2023-04-02 14:55:39,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:55:39,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2023-04-02 14:55:39,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=3399, Unknown=0, NotChecked=0, Total=3906 [2023-04-02 14:55:39,943 INFO L87 Difference]: Start difference. First operand 98 states and 105 transitions. Second operand has 52 states, 52 states have (on average 1.5384615384615385) internal successors, (80), 52 states have internal predecessors, (80), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:40,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:55:40,387 INFO L93 Difference]: Finished difference Result 131 states and 143 transitions. [2023-04-02 14:55:40,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-04-02 14:55:40,389 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.5384615384615385) internal successors, (80), 52 states have internal predecessors, (80), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2023-04-02 14:55:40,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:55:40,389 INFO L225 Difference]: With dead ends: 131 [2023-04-02 14:55:40,389 INFO L226 Difference]: Without dead ends: 76 [2023-04-02 14:55:40,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 170 SyntacticMatches, 24 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2990 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=964, Invalid=4888, Unknown=0, NotChecked=0, Total=5852 [2023-04-02 14:55:40,391 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 303 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 503 mSolverCounterSat, 229 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 732 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 229 IncrementalHoareTripleChecker+Valid, 503 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:55:40,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [303 Valid, 80 Invalid, 732 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [229 Valid, 503 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:55:40,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-04-02 14:55:40,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2023-04-02 14:55:40,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.0704225352112675) internal successors, (76), 71 states have internal predecessors, (76), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:40,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2023-04-02 14:55:40,418 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 72 [2023-04-02 14:55:40,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:55:40,418 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2023-04-02 14:55:40,418 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.5384615384615385) internal successors, (80), 52 states have internal predecessors, (80), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:55:40,418 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2023-04-02 14:55:40,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-04-02 14:55:40,418 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:55:40,418 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:55:40,424 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2023-04-02 14:55:40,619 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:55:40,619 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:55:40,619 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:55:40,619 INFO L85 PathProgramCache]: Analyzing trace with hash -896443424, now seen corresponding path program 33 times [2023-04-02 14:55:40,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:55:40,619 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71070876] [2023-04-02 14:55:40,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:55:40,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:55:40,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:55:48,083 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 10 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:55:48,083 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:55:48,083 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71070876] [2023-04-02 14:55:48,083 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [71070876] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:55:48,083 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49432801] [2023-04-02 14:55:48,083 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:55:48,083 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:55:48,083 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:55:48,084 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:55:48,086 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2023-04-02 14:55:48,236 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:55:48,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:55:48,239 WARN L260 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 230 conjunts are in the unsatisfiable core [2023-04-02 14:55:48,242 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:55:48,582 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:55:49,917 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:55:49,919 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:55:49,919 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2023-04-02 14:55:50,067 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 390 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:55:50,067 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:55:53,183 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 312 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-04-02 14:55:53,183 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [49432801] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:55:53,183 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1677899633] [2023-04-02 14:55:53,184 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:55:53,184 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:55:53,184 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:55:53,184 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:55:53,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:55:53,196 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:55:53,311 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:55:53,314 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:55:53,316 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:55:54,546 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21403#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:55:54,546 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:55:54,546 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:55:54,546 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 43, 30] total 111 [2023-04-02 14:55:54,547 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659786827] [2023-04-02 14:55:54,547 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:55:54,547 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2023-04-02 14:55:54,547 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:55:54,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2023-04-02 14:55:54,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=602, Invalid=14160, Unknown=0, NotChecked=0, Total=14762 [2023-04-02 14:55:54,549 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 111 states, 111 states have (on average 1.5405405405405406) internal successors, (171), 109 states have internal predecessors, (171), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:00,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:56:00,053 INFO L93 Difference]: Finished difference Result 121 states and 128 transitions. [2023-04-02 14:56:00,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2023-04-02 14:56:00,053 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 1.5405405405405406) internal successors, (171), 109 states have internal predecessors, (171), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2023-04-02 14:56:00,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:56:00,054 INFO L225 Difference]: With dead ends: 121 [2023-04-02 14:56:00,054 INFO L226 Difference]: Without dead ends: 116 [2023-04-02 14:56:00,055 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 162 SyntacticMatches, 11 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7406 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=1255, Invalid=22925, Unknown=0, NotChecked=0, Total=24180 [2023-04-02 14:56:00,055 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 9 mSDsluCounter, 313 mSDsCounter, 0 mSdLazyCounter, 3996 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 321 SdHoareTripleChecker+Invalid, 4147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 3996 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2023-04-02 14:56:00,055 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 321 Invalid, 4147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 3996 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2023-04-02 14:56:00,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2023-04-02 14:56:00,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 104. [2023-04-02 14:56:00,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 99 states have (on average 1.0808080808080809) internal successors, (107), 99 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:00,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 111 transitions. [2023-04-02 14:56:00,088 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 111 transitions. Word has length 75 [2023-04-02 14:56:00,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:56:00,089 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 111 transitions. [2023-04-02 14:56:00,089 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 111 states have (on average 1.5405405405405406) internal successors, (171), 109 states have internal predecessors, (171), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:00,089 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 111 transitions. [2023-04-02 14:56:00,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2023-04-02 14:56:00,089 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:56:00,089 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:56:00,094 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2023-04-02 14:56:00,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2023-04-02 14:56:00,290 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:56:00,290 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:56:00,290 INFO L85 PathProgramCache]: Analyzing trace with hash 775845174, now seen corresponding path program 34 times [2023-04-02 14:56:00,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:56:00,291 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2076361914] [2023-04-02 14:56:00,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:56:00,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:56:00,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:56:00,647 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2023-04-02 14:56:00,648 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:56:00,648 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2076361914] [2023-04-02 14:56:00,648 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2076361914] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:56:00,648 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974242460] [2023-04-02 14:56:00,648 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:56:00,648 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:56:00,648 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:56:00,653 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:56:00,655 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2023-04-02 14:56:00,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:56:00,794 INFO L262 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 28 conjunts are in the unsatisfiable core [2023-04-02 14:56:00,796 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:56:01,093 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2023-04-02 14:56:01,093 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:56:01,326 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2023-04-02 14:56:01,326 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974242460] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:56:01,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [796033697] [2023-04-02 14:56:01,327 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:56:01,327 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:56:01,327 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:56:01,327 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:56:01,328 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:56:01,339 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:56:01,439 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:56:01,442 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:56:01,444 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:56:01,955 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22416#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:56:01,955 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:56:01,955 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:56:01,955 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2023-04-02 14:56:01,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068226646] [2023-04-02 14:56:01,956 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:56:01,956 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-04-02 14:56:01,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:56:01,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-04-02 14:56:01,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=484, Invalid=2486, Unknown=0, NotChecked=0, Total=2970 [2023-04-02 14:56:01,957 INFO L87 Difference]: Start difference. First operand 104 states and 111 transitions. Second operand has 44 states, 44 states have (on average 1.2954545454545454) internal successors, (57), 44 states have internal predecessors, (57), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:02,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:56:02,410 INFO L93 Difference]: Finished difference Result 202 states and 216 transitions. [2023-04-02 14:56:02,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-04-02 14:56:02,410 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.2954545454545454) internal successors, (57), 44 states have internal predecessors, (57), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 76 [2023-04-02 14:56:02,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:56:02,411 INFO L225 Difference]: With dead ends: 202 [2023-04-02 14:56:02,411 INFO L226 Difference]: Without dead ends: 105 [2023-04-02 14:56:02,411 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 178 SyntacticMatches, 25 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1839 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=785, Invalid=3771, Unknown=0, NotChecked=0, Total=4556 [2023-04-02 14:56:02,412 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 529 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 529 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:56:02,412 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 73 Invalid, 601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 529 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:56:02,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2023-04-02 14:56:02,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2023-04-02 14:56:02,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.08) internal successors, (108), 100 states have internal predecessors, (108), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:02,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 112 transitions. [2023-04-02 14:56:02,452 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 112 transitions. Word has length 76 [2023-04-02 14:56:02,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:56:02,452 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 112 transitions. [2023-04-02 14:56:02,452 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.2954545454545454) internal successors, (57), 44 states have internal predecessors, (57), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:02,452 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 112 transitions. [2023-04-02 14:56:02,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-04-02 14:56:02,452 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:56:02,452 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:56:02,458 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2023-04-02 14:56:02,653 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2023-04-02 14:56:02,653 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:56:02,653 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:56:02,653 INFO L85 PathProgramCache]: Analyzing trace with hash -1466505684, now seen corresponding path program 35 times [2023-04-02 14:56:02,653 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:56:02,653 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428673126] [2023-04-02 14:56:02,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:56:02,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:56:02,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:56:03,059 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2023-04-02 14:56:03,059 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:56:03,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428673126] [2023-04-02 14:56:03,059 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428673126] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:56:03,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1827649784] [2023-04-02 14:56:03,059 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:56:03,059 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:56:03,059 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:56:03,060 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:56:03,062 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2023-04-02 14:56:03,357 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-04-02 14:56:03,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:56:03,360 INFO L262 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 28 conjunts are in the unsatisfiable core [2023-04-02 14:56:03,362 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:56:03,839 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2023-04-02 14:56:03,840 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:56:04,217 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2023-04-02 14:56:04,217 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1827649784] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:56:04,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [841316594] [2023-04-02 14:56:04,220 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:56:04,220 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:56:04,220 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:56:04,220 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:56:04,220 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:56:04,232 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:56:04,351 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:56:04,355 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:56:04,358 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:56:04,857 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23569#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:56:04,857 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:56:04,857 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:56:04,858 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2023-04-02 14:56:04,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270746738] [2023-04-02 14:56:04,858 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:56:04,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2023-04-02 14:56:04,858 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:56:04,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2023-04-02 14:56:04,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=578, Invalid=3844, Unknown=0, NotChecked=0, Total=4422 [2023-04-02 14:56:04,859 INFO L87 Difference]: Start difference. First operand 105 states and 112 transitions. Second operand has 56 states, 56 states have (on average 1.5535714285714286) internal successors, (87), 56 states have internal predecessors, (87), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:05,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:56:05,345 INFO L93 Difference]: Finished difference Result 140 states and 152 transitions. [2023-04-02 14:56:05,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-04-02 14:56:05,349 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.5535714285714286) internal successors, (87), 56 states have internal predecessors, (87), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2023-04-02 14:56:05,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:56:05,349 INFO L225 Difference]: With dead ends: 140 [2023-04-02 14:56:05,349 INFO L226 Difference]: Without dead ends: 81 [2023-04-02 14:56:05,350 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 182 SyntacticMatches, 26 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3447 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1105, Invalid=5537, Unknown=0, NotChecked=0, Total=6642 [2023-04-02 14:56:05,350 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 194 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 625 mSolverCounterSat, 226 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 851 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 226 IncrementalHoareTripleChecker+Valid, 625 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:56:05,351 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [194 Valid, 94 Invalid, 851 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [226 Valid, 625 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 14:56:05,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-04-02 14:56:05,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2023-04-02 14:56:05,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.0657894736842106) internal successors, (81), 76 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:05,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 85 transitions. [2023-04-02 14:56:05,380 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 85 transitions. Word has length 77 [2023-04-02 14:56:05,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:56:05,380 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 85 transitions. [2023-04-02 14:56:05,380 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.5535714285714286) internal successors, (87), 56 states have internal predecessors, (87), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:05,380 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 85 transitions. [2023-04-02 14:56:05,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2023-04-02 14:56:05,381 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:56:05,381 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:56:05,389 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2023-04-02 14:56:05,581 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2023-04-02 14:56:05,581 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:56:05,582 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:56:05,582 INFO L85 PathProgramCache]: Analyzing trace with hash -1530201533, now seen corresponding path program 36 times [2023-04-02 14:56:05,582 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:56:05,582 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134755890] [2023-04-02 14:56:05,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:56:05,582 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:56:05,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:56:15,320 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 36 proven. 419 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:56:15,320 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:56:15,320 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134755890] [2023-04-02 14:56:15,320 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134755890] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:56:15,320 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [714933687] [2023-04-02 14:56:15,320 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:56:15,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:56:15,321 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:56:15,322 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:56:15,323 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2023-04-02 14:56:15,482 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:56:15,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:56:15,486 WARN L260 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 246 conjunts are in the unsatisfiable core [2023-04-02 14:56:15,489 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:56:16,077 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:56:17,518 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:56:17,520 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:56:17,520 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2023-04-02 14:56:17,696 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 455 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:56:17,697 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:56:21,696 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 364 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2023-04-02 14:56:21,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [714933687] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:56:21,697 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1813619513] [2023-04-02 14:56:21,698 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:56:21,698 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:56:21,698 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:56:21,698 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:56:21,698 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:56:21,710 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:56:21,801 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:56:21,804 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:56:21,807 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:56:23,209 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24651#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:56:23,210 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:56:23,210 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:56:23,210 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 46, 32] total 121 [2023-04-02 14:56:23,210 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589733509] [2023-04-02 14:56:23,210 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:56:23,210 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2023-04-02 14:56:23,211 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:56:23,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2023-04-02 14:56:23,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=639, Invalid=16653, Unknown=0, NotChecked=0, Total=17292 [2023-04-02 14:56:23,212 INFO L87 Difference]: Start difference. First operand 81 states and 85 transitions. Second operand has 121 states, 121 states have (on average 1.5289256198347108) internal successors, (185), 119 states have internal predecessors, (185), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:30,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:56:30,013 INFO L93 Difference]: Finished difference Result 129 states and 136 transitions. [2023-04-02 14:56:30,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2023-04-02 14:56:30,014 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 1.5289256198347108) internal successors, (185), 119 states have internal predecessors, (185), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2023-04-02 14:56:30,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:56:30,014 INFO L225 Difference]: With dead ends: 129 [2023-04-02 14:56:30,015 INFO L226 Difference]: Without dead ends: 124 [2023-04-02 14:56:30,016 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 352 GetRequests, 174 SyntacticMatches, 9 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7914 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=1447, Invalid=27623, Unknown=0, NotChecked=0, Total=29070 [2023-04-02 14:56:30,017 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 9 mSDsluCounter, 325 mSDsCounter, 0 mSdLazyCounter, 4395 mSolverCounterSat, 219 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 4614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 219 IncrementalHoareTripleChecker+Valid, 4395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2023-04-02 14:56:30,017 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 333 Invalid, 4614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [219 Valid, 4395 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2023-04-02 14:56:30,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2023-04-02 14:56:30,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 111. [2023-04-02 14:56:30,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.0754716981132075) internal successors, (114), 106 states have internal predecessors, (114), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:30,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 118 transitions. [2023-04-02 14:56:30,075 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 118 transitions. Word has length 80 [2023-04-02 14:56:30,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:56:30,075 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 118 transitions. [2023-04-02 14:56:30,076 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 1.5289256198347108) internal successors, (185), 119 states have internal predecessors, (185), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:30,076 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 118 transitions. [2023-04-02 14:56:30,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-04-02 14:56:30,076 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:56:30,076 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:56:30,087 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2023-04-02 14:56:30,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:56:30,283 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:56:30,283 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:56:30,283 INFO L85 PathProgramCache]: Analyzing trace with hash 1386300003, now seen corresponding path program 37 times [2023-04-02 14:56:30,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:56:30,283 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012944862] [2023-04-02 14:56:30,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:56:30,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:56:30,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:56:30,846 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 92 proven. 104 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2023-04-02 14:56:30,846 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:56:30,846 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012944862] [2023-04-02 14:56:30,847 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012944862] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:56:30,847 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140882683] [2023-04-02 14:56:30,847 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:56:30,847 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:56:30,847 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:56:30,848 INFO L229 MonitoredProcess]: Starting monitored process 38 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:56:30,850 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2023-04-02 14:56:31,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:56:31,018 INFO L262 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 30 conjunts are in the unsatisfiable core [2023-04-02 14:56:31,020 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:56:31,362 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2023-04-02 14:56:31,362 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:56:31,624 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2023-04-02 14:56:31,624 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2140882683] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:56:31,624 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [224183294] [2023-04-02 14:56:31,625 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:56:31,625 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:56:31,625 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:56:31,625 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:56:31,625 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:56:31,637 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:56:31,737 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:56:31,742 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:56:31,745 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:56:32,313 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25737#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:56:32,314 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:56:32,314 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:56:32,314 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 47 [2023-04-02 14:56:32,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917533721] [2023-04-02 14:56:32,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:56:32,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2023-04-02 14:56:32,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:56:32,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2023-04-02 14:56:32,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=546, Invalid=2760, Unknown=0, NotChecked=0, Total=3306 [2023-04-02 14:56:32,317 INFO L87 Difference]: Start difference. First operand 111 states and 118 transitions. Second operand has 47 states, 47 states have (on average 1.2765957446808511) internal successors, (60), 47 states have internal predecessors, (60), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:32,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:56:32,857 INFO L93 Difference]: Finished difference Result 216 states and 230 transitions. [2023-04-02 14:56:32,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-04-02 14:56:32,858 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.2765957446808511) internal successors, (60), 47 states have internal predecessors, (60), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2023-04-02 14:56:32,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:56:32,858 INFO L225 Difference]: With dead ends: 216 [2023-04-02 14:56:32,858 INFO L226 Difference]: Without dead ends: 112 [2023-04-02 14:56:32,859 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 190 SyntacticMatches, 27 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2076 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=891, Invalid=4221, Unknown=0, NotChecked=0, Total=5112 [2023-04-02 14:56:32,859 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 764 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 832 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 764 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:56:32,859 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 93 Invalid, 832 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 764 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 14:56:32,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2023-04-02 14:56:32,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2023-04-02 14:56:32,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 107 states have (on average 1.074766355140187) internal successors, (115), 107 states have internal predecessors, (115), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:32,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 119 transitions. [2023-04-02 14:56:32,911 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 119 transitions. Word has length 81 [2023-04-02 14:56:32,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:56:32,911 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 119 transitions. [2023-04-02 14:56:32,911 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.2765957446808511) internal successors, (60), 47 states have internal predecessors, (60), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:32,911 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 119 transitions. [2023-04-02 14:56:32,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2023-04-02 14:56:32,912 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:56:32,912 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:56:32,921 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2023-04-02 14:56:33,118 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2023-04-02 14:56:33,118 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:56:33,119 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:56:33,119 INFO L85 PathProgramCache]: Analyzing trace with hash 1373043501, now seen corresponding path program 38 times [2023-04-02 14:56:33,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:56:33,119 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807912769] [2023-04-02 14:56:33,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:56:33,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:56:33,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:56:33,548 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2023-04-02 14:56:33,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:56:33,548 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1807912769] [2023-04-02 14:56:33,548 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1807912769] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:56:33,548 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050277213] [2023-04-02 14:56:33,548 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:56:33,548 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:56:33,549 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:56:33,553 INFO L229 MonitoredProcess]: Starting monitored process 39 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:56:33,556 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2023-04-02 14:56:33,828 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-04-02 14:56:33,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:56:33,832 INFO L262 TraceCheckSpWp]: Trace formula consists of 486 conjuncts, 30 conjunts are in the unsatisfiable core [2023-04-02 14:56:33,834 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:56:34,359 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2023-04-02 14:56:34,359 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:56:34,781 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2023-04-02 14:56:34,781 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2050277213] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:56:34,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [635144063] [2023-04-02 14:56:34,782 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:56:34,782 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:56:34,782 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:56:34,782 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:56:34,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:56:34,798 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:56:34,927 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:56:34,932 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:56:34,935 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:56:35,489 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26968#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:56:35,489 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:56:35,489 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:56:35,489 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 60 [2023-04-02 14:56:35,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423251388] [2023-04-02 14:56:35,489 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:56:35,492 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2023-04-02 14:56:35,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:56:35,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2023-04-02 14:56:35,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=654, Invalid=4316, Unknown=0, NotChecked=0, Total=4970 [2023-04-02 14:56:35,495 INFO L87 Difference]: Start difference. First operand 112 states and 119 transitions. Second operand has 60 states, 60 states have (on average 1.5333333333333334) internal successors, (92), 60 states have internal predecessors, (92), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:36,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:56:36,032 INFO L93 Difference]: Finished difference Result 149 states and 161 transitions. [2023-04-02 14:56:36,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-04-02 14:56:36,032 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.5333333333333334) internal successors, (92), 60 states have internal predecessors, (92), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 82 [2023-04-02 14:56:36,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:56:36,033 INFO L225 Difference]: With dead ends: 149 [2023-04-02 14:56:36,033 INFO L226 Difference]: Without dead ends: 86 [2023-04-02 14:56:36,033 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 194 SyntacticMatches, 28 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3936 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1256, Invalid=6226, Unknown=0, NotChecked=0, Total=7482 [2023-04-02 14:56:36,033 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 272 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 751 mSolverCounterSat, 214 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 965 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 214 IncrementalHoareTripleChecker+Valid, 751 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:56:36,034 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 122 Invalid, 965 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [214 Valid, 751 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 14:56:36,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2023-04-02 14:56:36,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2023-04-02 14:56:36,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 81 states have (on average 1.0617283950617284) internal successors, (86), 81 states have internal predecessors, (86), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:36,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 90 transitions. [2023-04-02 14:56:36,068 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 90 transitions. Word has length 82 [2023-04-02 14:56:36,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:56:36,068 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 90 transitions. [2023-04-02 14:56:36,068 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 1.5333333333333334) internal successors, (92), 60 states have internal predecessors, (92), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:56:36,068 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 90 transitions. [2023-04-02 14:56:36,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2023-04-02 14:56:36,068 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:56:36,068 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:56:36,074 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2023-04-02 14:56:36,268 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2023-04-02 14:56:36,269 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:56:36,269 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:56:36,269 INFO L85 PathProgramCache]: Analyzing trace with hash -451096896, now seen corresponding path program 39 times [2023-04-02 14:56:36,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:56:36,269 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950150171] [2023-04-02 14:56:36,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:56:36,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:56:36,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:56:46,571 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 28 proven. 497 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:56:46,571 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:56:46,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950150171] [2023-04-02 14:56:46,571 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [950150171] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:56:46,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [599945294] [2023-04-02 14:56:46,571 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:56:46,571 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:56:46,571 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:56:46,572 INFO L229 MonitoredProcess]: Starting monitored process 40 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:56:46,574 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2023-04-02 14:56:46,752 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:56:46,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:56:46,756 WARN L260 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 266 conjunts are in the unsatisfiable core [2023-04-02 14:56:46,760 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:56:47,271 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-04-02 14:56:48,883 INFO L173 IndexEqualityManager]: detected equality via solver [2023-04-02 14:56:48,885 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-04-02 14:56:48,885 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2023-04-02 14:56:49,056 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 0 proven. 525 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 14:56:49,056 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:56:53,404 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-04-02 14:56:53,404 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [599945294] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:56:53,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2134878669] [2023-04-02 14:56:53,405 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:56:53,405 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:56:53,405 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:56:53,405 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:56:53,405 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:56:53,416 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:56:53,510 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:56:53,513 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:56:53,515 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:56:54,909 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28118#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:56:54,909 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:56:54,909 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:56:54,909 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 49, 34] total 128 [2023-04-02 14:56:54,909 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744348360] [2023-04-02 14:56:54,910 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:56:54,910 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2023-04-02 14:56:54,910 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:56:54,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2023-04-02 14:56:54,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=762, Invalid=18420, Unknown=0, NotChecked=0, Total=19182 [2023-04-02 14:56:54,912 INFO L87 Difference]: Start difference. First operand 86 states and 90 transitions. Second operand has 128 states, 128 states have (on average 1.53125) internal successors, (196), 126 states have internal predecessors, (196), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:57:02,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:57:02,417 INFO L93 Difference]: Finished difference Result 137 states and 144 transitions. [2023-04-02 14:57:02,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2023-04-02 14:57:02,418 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 1.53125) internal successors, (196), 126 states have internal predecessors, (196), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2023-04-02 14:57:02,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:57:02,418 INFO L225 Difference]: With dead ends: 137 [2023-04-02 14:57:02,419 INFO L226 Difference]: Without dead ends: 132 [2023-04-02 14:57:02,421 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 187 SyntacticMatches, 9 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9925 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=1627, Invalid=30235, Unknown=0, NotChecked=0, Total=31862 [2023-04-02 14:57:02,421 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 8 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 4957 mSolverCounterSat, 186 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 357 SdHoareTripleChecker+Invalid, 5143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 186 IncrementalHoareTripleChecker+Valid, 4957 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:57:02,421 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 357 Invalid, 5143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [186 Valid, 4957 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2023-04-02 14:57:02,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2023-04-02 14:57:02,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 118. [2023-04-02 14:57:02,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0707964601769913) internal successors, (121), 113 states have internal predecessors, (121), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:57:02,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 125 transitions. [2023-04-02 14:57:02,479 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 125 transitions. Word has length 85 [2023-04-02 14:57:02,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:57:02,479 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 125 transitions. [2023-04-02 14:57:02,479 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 1.53125) internal successors, (196), 126 states have internal predecessors, (196), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:57:02,479 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 125 transitions. [2023-04-02 14:57:02,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-04-02 14:57:02,480 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:57:02,480 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:57:02,486 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2023-04-02 14:57:02,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:57:02,683 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:57:02,683 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:57:02,683 INFO L85 PathProgramCache]: Analyzing trace with hash 867126230, now seen corresponding path program 40 times [2023-04-02 14:57:02,683 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:57:02,684 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [852954076] [2023-04-02 14:57:02,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:57:02,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:57:02,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:57:03,226 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 106 proven. 119 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2023-04-02 14:57:03,226 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:57:03,227 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [852954076] [2023-04-02 14:57:03,227 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [852954076] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:57:03,227 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1331557048] [2023-04-02 14:57:03,227 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:57:03,227 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:57:03,227 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:57:03,228 INFO L229 MonitoredProcess]: Starting monitored process 41 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:57:03,229 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2023-04-02 14:57:03,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:57:03,409 INFO L262 TraceCheckSpWp]: Trace formula consists of 506 conjuncts, 32 conjunts are in the unsatisfiable core [2023-04-02 14:57:03,411 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:57:03,789 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2023-04-02 14:57:03,789 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:57:04,091 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2023-04-02 14:57:04,091 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1331557048] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:57:04,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [550100617] [2023-04-02 14:57:04,092 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:57:04,092 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:57:04,092 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:57:04,092 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:57:04,092 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:57:04,103 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:57:04,195 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:57:04,199 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:57:04,201 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:57:04,730 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29269#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:57:04,730 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:57:04,730 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:57:04,730 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 50 [2023-04-02 14:57:04,730 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664813099] [2023-04-02 14:57:04,730 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:57:04,731 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-04-02 14:57:04,731 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:57:04,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-04-02 14:57:04,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=612, Invalid=3048, Unknown=0, NotChecked=0, Total=3660 [2023-04-02 14:57:04,732 INFO L87 Difference]: Start difference. First operand 118 states and 125 transitions. Second operand has 50 states, 50 states have (on average 1.26) internal successors, (63), 50 states have internal predecessors, (63), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:57:05,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:57:05,258 INFO L93 Difference]: Finished difference Result 230 states and 244 transitions. [2023-04-02 14:57:05,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-04-02 14:57:05,258 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.26) internal successors, (63), 50 states have internal predecessors, (63), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2023-04-02 14:57:05,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:57:05,259 INFO L225 Difference]: With dead ends: 230 [2023-04-02 14:57:05,259 INFO L226 Difference]: Without dead ends: 119 [2023-04-02 14:57:05,260 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 202 SyntacticMatches, 29 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2327 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1004, Invalid=4696, Unknown=0, NotChecked=0, Total=5700 [2023-04-02 14:57:05,260 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 543 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 543 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:57:05,261 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 49 Invalid, 625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 543 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:57:05,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2023-04-02 14:57:05,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2023-04-02 14:57:05,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.0701754385964912) internal successors, (122), 114 states have internal predecessors, (122), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:57:05,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 126 transitions. [2023-04-02 14:57:05,325 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 126 transitions. Word has length 86 [2023-04-02 14:57:05,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:57:05,325 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 126 transitions. [2023-04-02 14:57:05,325 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.26) internal successors, (63), 50 states have internal predecessors, (63), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:57:05,326 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 126 transitions. [2023-04-02 14:57:05,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-04-02 14:57:05,326 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:57:05,326 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:57:05,335 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2023-04-02 14:57:05,535 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2023-04-02 14:57:05,536 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:57:05,536 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:57:05,536 INFO L85 PathProgramCache]: Analyzing trace with hash -1040219828, now seen corresponding path program 41 times [2023-04-02 14:57:05,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:57:05,536 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306845486] [2023-04-02 14:57:05,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:57:05,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:57:05,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:57:06,069 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 91 proven. 134 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-04-02 14:57:06,069 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:57:06,069 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306845486] [2023-04-02 14:57:06,069 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [306845486] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:57:06,069 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [842382475] [2023-04-02 14:57:06,069 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:57:06,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:57:06,069 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:57:06,070 INFO L229 MonitoredProcess]: Starting monitored process 42 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:57:06,072 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2023-04-02 14:57:06,479 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-04-02 14:57:06,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:57:06,483 INFO L262 TraceCheckSpWp]: Trace formula consists of 515 conjuncts, 32 conjunts are in the unsatisfiable core [2023-04-02 14:57:06,485 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:57:07,078 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 105 proven. 120 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-04-02 14:57:07,079 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:57:07,549 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 105 proven. 120 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2023-04-02 14:57:07,549 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [842382475] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:57:07,549 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1962084055] [2023-04-02 14:57:07,550 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 14:57:07,550 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:57:07,550 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:57:07,550 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:57:07,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:57:07,561 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 22 for LOIs [2023-04-02 14:57:07,662 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2023-04-02 14:57:07,667 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 14:57:07,670 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:57:08,198 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30578#(and (<= 1 |#StackHeapBarrier|) (<= ~SIZE~0 32767) (<= 2 ~SIZE~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:57:08,199 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:57:08,199 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:57:08,199 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 64 [2023-04-02 14:57:08,199 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606961760] [2023-04-02 14:57:08,199 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:57:08,199 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2023-04-02 14:57:08,199 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:57:08,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2023-04-02 14:57:08,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=735, Invalid=4815, Unknown=0, NotChecked=0, Total=5550 [2023-04-02 14:57:08,201 INFO L87 Difference]: Start difference. First operand 119 states and 126 transitions. Second operand has 64 states, 64 states have (on average 1.515625) internal successors, (97), 64 states have internal predecessors, (97), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:57:08,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:57:08,782 INFO L93 Difference]: Finished difference Result 158 states and 170 transitions. [2023-04-02 14:57:08,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-04-02 14:57:08,782 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.515625) internal successors, (97), 64 states have internal predecessors, (97), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 87 [2023-04-02 14:57:08,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:57:08,783 INFO L225 Difference]: With dead ends: 158 [2023-04-02 14:57:08,783 INFO L226 Difference]: Without dead ends: 91 [2023-04-02 14:57:08,783 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 206 SyntacticMatches, 30 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4457 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1417, Invalid=6955, Unknown=0, NotChecked=0, Total=8372 [2023-04-02 14:57:08,784 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 359 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 754 mSolverCounterSat, 274 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 359 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 1028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 274 IncrementalHoareTripleChecker+Valid, 754 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 14:57:08,784 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [359 Valid, 84 Invalid, 1028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [274 Valid, 754 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 14:57:08,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2023-04-02 14:57:08,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2023-04-02 14:57:08,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.058139534883721) internal successors, (91), 86 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:57:08,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 95 transitions. [2023-04-02 14:57:08,840 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 95 transitions. Word has length 87 [2023-04-02 14:57:08,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:57:08,840 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 95 transitions. [2023-04-02 14:57:08,840 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.515625) internal successors, (97), 64 states have internal predecessors, (97), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 14:57:08,840 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 95 transitions. [2023-04-02 14:57:08,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2023-04-02 14:57:08,841 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:57:08,841 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:57:08,851 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2023-04-02 14:57:09,048 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:57:09,049 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:57:09,049 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:57:09,049 INFO L85 PathProgramCache]: Analyzing trace with hash 1233470947, now seen corresponding path program 42 times [2023-04-02 14:57:09,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:57:09,050 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444596019] [2023-04-02 14:57:09,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:57:09,050 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms